|Cao Văn Viên|
|(l-r) Lt. Gen. Hoàng Xuân Lãm, I Corps; Gen. Cao Văn Viên; Lt. Gen. Richard G. Stilwell; Maj. Gen. Ngô Quang Trưởng|
December 21, 1921|
January 22, 2008 (aged 86)|
Annandale, Virginia, USA
|Occupation||Soldier; civil servant|
|Spouse(s)||Tao Thi Tran (died 1991)|
|Children||Cao Anh Tuan (died 1996); Cao Anh Dzung (missing); Lan Cao|
|Allegiance||State of Vietnam; South Vietnam|
|Years of service||
1949 – October 25, 1955 (Vietnamese National Army)|
October 26, 1955 – April 30, 1975 (Army of the Republic of Vietnam)
|Commands held||Vietnamese Airborne Division; III Corps; Chairman, Joint General Staff, Vietnamese Armed Forces; Vietnamese Navy (acting)|
|Battles/wars||Battle of Kiến Phong (now Đồng Tháp Province)|
|Awards||National Order of Vietnam; Silver Star; Legion of Merit|
Cao Văn Viên (December 21, 1921 – January 22, 2008) was a Vietnamese soldier who served in the Army of the Republic of Vietnam (ARVN) and rose to the position of Chairman of the South Vietnamese Joint General Staff. Considered one of "the most gifted" of South Vietnam's military leaders, he has been called "absolutely a key figure" and one of "the most important Vietnamese military leaders" in the US-led fighting during the Vietnam War. Along with Trần Thiện Khiêm, he was one of only two four-star generals in the entire history of South Vietnam.
Viên was born to Vietnamese parents in Vientiane, Laos, in December 1921. His father was a merchant. Hearing rumors of a gold rush in the Mekong Delta, he moved to what was then called Cochinchina to become a prospector. Although he became a follower of Ho Chi Minh and fought as a guerrilla against French colonial rule, he soon concluded that Minh's movement was more communist than nationalist and joined independent fighter groups. He was captured by the French, released, and enrolled at the University of Saigon where he obtained a bachelor's degree in French literature. His schoolmate was Lâm Quang Thi.
Viên attended the French-run Cap Saint Jacques Military School, graduating with a commission in the Vietnamese National Army as a second lieutenant in 1949. He rose quickly through the ranks, becoming a battalion commander in 1953 and major in 1954. He attended the Vietnamese National Military Academy as a lieutenant, where he met and became friendly with many of South Vietnam's later military leaders. He twice served in military intelligence (in 1953 and 1954), and twice as a military logistics officer. After the formation of the Army of the Republic of Vietnam (ARVN) in 1955, he was appointed chief of military logistics for the ARVN Joint General Staff. He graduated from the United States Army Command and General Staff College in 1957. By 1960, he had completed parachute training with both the Vietnamese and American military, earned his Vietnamese combat pilot's license, and earned his American combat helicopter pilot's license. Viên was promoted to lieutenant colonel and appointed Chief of Staff of the Special Military Staff in the office of the President of the Republic in 1956. He and his family moved to a modest home in the Cholon neighborhood of Saigon (where he lived until April 1975). He was promoted to colonel in 1960 and named Commander of the Vietnamese Airborne Division in November 1960. This came after Colonel Nguyễn Chánh Thi and Lieutenant Colonel Vương Văn Đông, the two highest-ranking paratroopers led a failed coup attempt against Diem and fled into exile in Cambodia. Based on his experiences, Viên concluded in 1961 that the Viet Cong were no longer acting alone but were being led and reinforced by regular units of the People's Army of Vietnam (PAVN).
Viên refused to participate in the 1963 coup against South Vietnamese President Ngô Đình Diệm. He was one of several military leaders who were unaware of the coup. When called to a lunchtime meeting with other senior officers and informed of the coup d'état, he reportedly broke down in tears and resigned, refusing to go along with the putsch. Vien was not aware of the plot, and the generals had discussed whether to assassinate him during their planning phase because they knew he was a Diem admirer. His loyalty to the conspirators now suspect, a rifle was thrust into his back and he was moments from being killed. But Major General Tôn Thất Đính had spoken with General Dương Văn Minh during the planning for the coup and convinced Minh to save Viên's life. Dinh played mahjong with Vien's wife, and had convinced Minh that Vien would not oppose the coup. Vien had planned with Diem to allow the president to take refuge at his home in the event of a coup, but the offer could not be taken up because the rebels surrounded Vien's house after taking him into custody. Another account has him accepting the coup after being informed of it. General Lâm Quang Thi later recalled that Viên was a Diem loyalist, but remained neutral during the coup. Viên was briefly imprisoned and stripped of his command, but reinstated a month later.
Col. Viên was a critical supporter of the 1964 South Vietnamese coup in which President Dương Văn Minh was toppled by General Nguyễn Khánh, plotting with him to overthrow Minh and successfully ordering his Airborne Division troops to help secure the capital. By March 14, Viên had been promoted by the new regime to brigadier general.
Viên was named Commander of III Corps, which held the critical region around Saigon. While commanding troops during action in Kiến Phong Province (now Đồng Tháp Province) in March 1964, his unit was ambushed and surrounded on three sides. Viên was wounded in the upper arm and shoulder, and was decorated by the United States with the Silver Star and by the Republic of Vietnam with the National Order of Vietnam (Knight). The Silver Star citation said that while leading his men in an anti-communist assault, and despite "the confusion and inferno of enemy fire" from both sides and an arm and shoulder wound, Vien "continued to exercise command vigorously and effectively until the enemy had been routed". Viên was the first senior South Vietnamese military officer to be wounded in the field. His actions won him widespread respect from American military officers.
Viên was appointed Chief of Staff of the Joint General Staff (JGS) on September 11, 1964, after President Khanh dismissed General Nguyễn Văn Thiệu in order to win Buddhist support for his government. As Chief of Staff of the JGS, he controlled troop movements around the capital and assigned officers to a few critical positions. He supported Khanh and helped suppress a counter-coup by Major General Dương Văn Đức on September 14, 1964. He helped put down another coup on September 27. Along with General Nguyễn Chánh Thi, Air Commodore Nguyễn Cao Kỳ, General Nguyễn Văn Thiệu, and Admiral Chung Tấn Cang, he supported a coup against Prime Minister Trần Văn Hương in December 1964. He led the then-biggest helicopter attack of the war in February 1965. When Viet Cong forces launched a mortar attack on the city of Đồng Xoài on June 10, 1965, Viên held U.S. forces from attacking—keeping the U.S. out of the war at a time when the United States was still attempting to avoid active involvement in the war. When President Phan Khắc Sửu resigned on June 17, 1965, and now-Air Marshall Nguyễn Cao Kỳ succeeded him, Viên was made a member of the military council which acted as a de facto cabinet.
Joint General Staff
Viên was promoted to Chief of the Joint General Staff (JGS) on October 1, 1965. He was promoted to major general on November 1, 1965, during the celebrations accompanying the second anniversary of Diem's assassination, and by January 1966 had been promoted again to lieutenant general. Viên seemed an unlikely choice for such a high position, but he was one of the few generals who could not be accused of having cooperated with the French colonial regime, his loyalty to the Diem regime and his role as a coup leader made him acceptable to conservatives and liberals alike, and he was remarkably apolitical. The appointment may also not have been as important as it appeared, for the JGS was almost routinely excluded from command decisions (which were often made by South Vietnam's military presidents). He had no authority to promote colonels to general, or promote generals to higher rank. At least one historian has characterized his tenure as JGS Chief as "ineffectual". An American general later said he believed that Viên used presidential interference in JGS decision-making as a means of avoiding blame and therefore did not challenge presidential decisions as much as he might otherwise have done. Major General Hoàng Xuân Lãm (Commander, I Corps) and Lieutenant General Lê Nguyên Khang (Commander, III Corps) were both particularly loyal to Viên, and helped the South Vietnamese government retain some degree of political stability. His control over the Corps was further strengthened when Prime Minister Kỳ appointed Brigadier General Nguyễn Văn Mạnh, another Viên loyalist, Commander of IV Corps in November 1966. With this appointment, Viên (along with Kỳ, Khang, and director of information Lt. Gen. Nguyễn Bảo Trí) was considered by American observers to be one of the most powerful people in the government.
Viên nonetheless attempted to be an active strategic thinker and reformer as JGS Chief. In 1965, he proposed invading Laos and establishing a defensive line across the southern portion of that country in order to cut off the Viet Cong's flow of supplies coming down the Ho Chi Minh trail. He met with U.S. President Lyndon B. Johnson in Guam in February 1966 to discuss the plan, but Johnson refused to authorize U.S. military support for the campaign and it never went forward. In September 1966, Viên sought and won command of the Vietnamese Navy and for the first time integrated naval plans into JGS planning, but this arrangement lasted only two months. Viên also worked to improve the relationship between his military leaders and their American advisors. When a leading general complained that American advisors were interfering in the chain of command, Viên held a meeting of all senior military leaders to smooth over the differences and reassure his commanders. Unlike many senior South Vietnamese military leaders, he was not shy of strongly criticizing units and commanders which he felt did not perform well. He said the 25th Division, led by Brigadier General Phân Trường Chinh, was "the worst division in ARVN, and possibly the worst division in any army." He instituted modern accounting systems to improve the payment of salaries and benefits, and fought for and won a harsh new law designed to catch and punish deserters. He also retained a limited role in commanding troops in the field. At the command of Prime Minister Kỳ, he personally led troops to Da Nang and Huế during the Buddhist Uprising of April 1966 and helped crush the rebellion of General Chánh Thi. He also instituted new fire control procedures designed to reduce air and artillery strikes against civilian targets. Even as late as 1968, he was in the field assessing the use of modern weapons (such as heavy helicopters and advanced missiles) by the enemy.
On January 26, 1967, Prime Minister Kỳ announced that Lt. Gen. Nguyễn Hữu Có had been replaced as Defense Minister by Lt. Gen. Viên. Viên did not, however, assume the post of Deputy Prime Minister as the Defense Minister usually did. Viên was promoted to full General on February 5, 1967. In his role as Defense Minister, General Viên and Lt. Gen. Nguyễn Văn Vy were appointed to a committee to investigate and root out corruption among the top South Vietnamese military leadership. More than 50 ARVN officers were removed from service in the campaign's first push. (After the war ended, however, Viên was accused of refusing to act on accusations of corruption presented to him.) Viên also strongly criticized in a letter to General William Westmoreland (the senior U.S. military commander in South Vietnam) what he saw as an over-pessimistic and derogatory article by the U.S. news media about South Vietnamese troops and combat actions. Gen. Westmoreland subsequently assigned "military-information advisors" at the corps and division level to smooth over relations.
The summer of 1967, Viên played a critical role in helping overcome a political crisis in the government. In September 1966, South Vietnamese voters elected a Constituent Assembly which was charged with writing a new constitution for the Republic of Vietnam. The new constitution was promulgated in March 1967, and local elections held. A presidential election was scheduled for September 3, 1967, but Air Marshal and Prime Minister Nguyễn Cao Kỳ and Head of State Gen. Nguyễn Văn Thiệu both sought the presidency. With the U.S. military preparing for a major expansion in its armed forces in Vietnam, American diplomats and senior military officers made it clear that they would not tolerate another military coup or interference in the electoral process. Under the pretense of holding a meeting of the Armed Forces Council (an informal body of senior army, navy, and air force leaders to discuss military policy), Lt. Gen. Viên forced the military to resolve the crisis by unofficially backing one of the two candidates. With the assent of Prime Minister Kỳ, the support was unofficial so that if the military's candidate did not win the loss would not be seen as a public lack of confidence in the armed forces. After a three-day meeting, the military agreed to support Thiệu for president and Kỳ for executive vice president. Viên may have supported a Kỳ candidacy at first. According to Ky, Viên was for a short time considered for the presidency, but Viên refused and no majority formed behind his candidacy. Viên subsequently traveled to Thailand and met with exiled general Dương Văn Minh, warning him not to return to South Vietnam in an attempt to seek the presidency.
On August 10, 1967, Viên held his first press conference since becoming Chief of the JGS or Defense Minister, and accidentally revealed the existence of a secret, major bombing campaign against Viet Cong and PAVN troops in Cambodia. Since 1965, the United States had been making increasingly regular bombing raids on suspected Viet Cong and PAVN staging and supply areas throughout Cambodia. In his press conference on August 10, Gen. Viên briefly discussed the existence of the secret bombings, and declared them a failure. The U.S. government immediately and categorically denied that any such bombings had taken place. Gen. Viên was the first high military official in either South Vietnam or the United States to admit that the U.S. was bombing Cambodia.
Thiệu had initially signalled that he would replace Viên as Defense Minister with Lt. Gen. Vy if he won the presidency. But when Thiệu won the presidential election on September 3, he agreed to keep Viên as Defense Minister even though most of the cabinet would now be civilians rather than military personnel. He was also a member of the National Security Council, a body created by the new constitution to advise the President and Prime Minister on issues of national importance. He continued to act as a chief military strategist for the government, working with Gen. Westmoreland on the Combined Campaign Plan for 1967. In his role as Chief of the JGS and Defense Minister, Viên was the highest-ranking government official to greet President Johnson at Cam Ranh Bay when he made his second battle-zone trip to Vietnam in December 1967.
As Defense Minister, Gen. Viên also attempted to reform the government's pacification campaign. The failure of the Strategic Hamlet Program (an attempt to separate peasants from the Viet Cong by moving the population into fortified villages) by 1963 led to a re-emphasis on a military solution by 1965. The Phoenix Program, designed to identify and either capture or kill Viet Cong insurgents, was implemented and the South Vietnamese government began to focus on the "Revolutionary Development" program of economic development. In 1966, Viên and Westmoreland agreed to train ARVN troops in "clear and hold" pacification tactics. Although the American and South Vietnamese governments both realized the importance of pacification, the pacification program showed few results and was close to collapse by mid-1967. In September 1967, Major General Nguyễn Đức Thắng, Viên's deputy at the JGS, was appointed Minister of Construction and Development to revitalize the pacification program. Thắng proposed and Viên approved a plan for reform that would: 1) Require provincial chiefs to report to the Ministry of Construction and Development and the Minister for Pacification in Saigon and not military Corps commanders; 2) Strip Corps commanders of their ability to appoint province chiefs; 3) Transfer the role of Government Delegate for each province from Corps commanders to civilian political leaders; and 4) Transfer control of ARVN battalions engaged in pacification campaigns from Corps commanders to the Minister for Pacification. Viên sought the advice of Gen. Westmoreland, who agreed that the plan should be implemented. But President Thiệu repeatedly refused to implement the plan, fearing the loss of political support. Angry at Thiệu's action, Maj. Gen. Thắng resigned in January 1968 and became Viên's personal assistant.
Thiệu replaced Viên as Defense Minister with Lt. Gen. Nguyễn Văn Vy on November 98, 1967. Viên's departure was not seen as a snub or loss of political power, but rather as a way of relieving him of the less important duties of Defense Minister so that he could focus on prosecuting the war.
Role during Tet Offensive
Viên played a critical role in the Tet Offensive of January 31, 1968. Fearing an attack during Tết (the Vietnamese New Year), Westmoreland had advised Viên to limit the traditional Tết cease-fire to just 24 hours. Viên tried but failed to win approval for this limitation. Viet Cong and PAVN forces attacked I and II Corps shortly after midnight on January 31, and Saigon and III Corps at about 3 AM local time. Not alerted to the extent of the battle due to disruptions in communications but realizing after several hours that a major attack on Saigon was under way, Viên was forced to drive himself through the back streets of Saigon at 7 AM to reach JGS headquarters at Tân Sơn Nhứt Airport. JGS Headquarters was one of six critical targets for the communist forces, and elements of the C-10 Sapper Battalion were assigned to attack the building. Shortly after his arrival, enemy combatants seized control of Gate 4 at the airport and were threatening to attack JGS Headquarters. By sheer luck, two armed and supplied battalions were at Tân Sơn Nhứt awaiting transport to I Corps. Viên immediately ordered their dispersal throughout the city of Saigon, preventing a collapse in the city's defense. Retaining two companies, he ordered a counter-attack against the enemy elements controlling access to the airport and threw them back. Due to the severe lack of personnel, Vien used almost his entire staff as combat personnel and took personal command of them in the field to repel the communist attack on the air base. Majors and colonels led platoons and captains and lieutenants acted as privates. Thanks to Gen. Viên's actions, JGS Headquarters remained the only secure military location in Saigon. Kỳ and most of the top generals in the city spent the next several days in Viên's office coordinating the counter-attack, sleeping on his office rug at night. Viên coordinated the city's defense throughout the first critical hours of the Tet Offensive, ordering JGS officers and staff into the streets to personally lead combat divisions throughout Saigon. Most of the fighting in the city ended by dawn the next day, although small elements of communist forces held out until March 7 Viên personally led troops in Operation Tran Hung Dao, the counter-offensive which began on February 3.
In the aftermath of the Tet Offensive, Viên became convinced that North Vietnam intended to cut South Vietnam in two by occupying the Tây Nguyên, or Central Highlands. Westmoreland disagreed, and reinforced Khe Sanh more than 185 miles (300 km) to the north. On April 1, 1968, Viên attended a meeting at Nha Trang called by Gen. Westmoreland and attended by Westmoreland, Lt. Gen. Lê Nguyên Khang (Commander of III Corps), Gen. Creighton Abrams (who was due to succeed Westmoreland on June 10, 1968), and Deputy Ambassador to Vietnam Samuel D. Berger. Berger made an impromptu speech declaring the Tet Offensive a great victory for South Vietnam and urging support for President Thiệu (rumors of another coup were rife). But angry at what he perceived as President Thiệu's lack of aggressive prosecution of the war and exhausted by his duties, Viên allegedly attempted to resign on April 3, 1968. Viên then denied he had done so, instead saying that he threatened to do so if U.S. and South Vietnamese forces were put under a unified command.
Vien later criticised the US and South Vietnam for not pressing home their advantage and going on a large-scale offensive in an attempt to totally defeat the communists immediately.
Post-Defense Minister role
Thiệu considered replacing Viên as JGS Chair in June 1968, but kept him in the position. Viên remained a strong supporter of Executive Vice President Kỳ, who remained a very powerful figure in the government and had the support of nearly 1 million Roman Catholic refugees in the country. Viên (like Kỳ) opposed the appointment of Trần Văn Hương as Prime Minister, and Kỳ signalled to President Thiệu that he would not like to see Viên or the other generals who supported Kỳ removed from their positions. Viên subsequently accompanied Thiệu to Hawaii for yet another meeting with President Johnson in July 1968 and to an eight-day state visit to Taiwan and South Korea in May 1969. Viên's political position remained unstable, however. Several times in 1969 and 1970, Prime Minister Trần Văn Hương advised Thiệu to replace Vien with Lt. Gen. Đỗ Cao Trí.
Lt. Gen. Viên continued to act as chief strategist for South Vietnamese armed forces, but his influence was increasingly impaired. In June 1968, he advocated that the U.S. resume bombing of North Vietnam. In September 1968, he advocated the invasion and occupation of Cambodia, Laos, and southern North Vietnam. But as President Johnson and later President Richard Nixon began implementing the policy of Vietnamization (under which there would be gradual American troop withdrawals and extensive re-arming and training of ARVN forces with the aim of leaving the war completely in the hands of the South Vietnamese), Viên and other South Vietnamese military leaders were rarely consulted or informed ahead of time about these decisions. For example, when the U.S. considered an immediate halt to all bombing of North Vietnam in October 1968, only President Thiệu was consulted. Viên nonetheless was forced to help implement Vietnamization. Based on the conversations in Hawaii six months earlier, he held the first JGS discussions on American troop withdrawals in January 1969. Viên remained silent about his views of the American policy, but his aides were extremely pessimistic about its success. Viên did, however, support Ambassador Ellsworth Bunker's "One War" strategy (under which pacification, counter-insurgency, and Vietnamization all took equal importance) and assisted Gen. Abrams with developing the Combined (US/SVN) Strategic Objective Plan of 1969. The plan involved the transfer of hundreds of aging American military camps to the South Vietnamese armed forces. Many ARVN officers criticized Viên's plan to base ARVN troops in these static positions, arguing that it isolated the Army from the populace, hurt morale, and reduced mobility. Lt. Gen. Viên accompanied President Thiệu to Midway Atoll in June 1969, where the two men learned of President Nixon's intention to withdraw 25,000 American troops from South Vietnam within 60 days. In what became the then-largest single transfer of military equipment to South Vietnam, Lt. Gen. Viên received 64 river patrol boats from the United States just days later—yet another indication of the American withdrawal.
Viên continued to worry about the prosecution of the war effort. He told the press and his American military advisors that he expected the United States to maintain a force of at least 250,000 troops on the ground for the next several years, and that if the U.S. did not he did not expect South Vietnam to survive. Beginning in 1970, he asked to be relieved as Chief of the JGS and assigned command of the Airborne Brigade, but President Thiệu refused each time (wishing to retain the apolitical general in this critical role). As Vietnamization continued, Viên clamped down once more on the American press. He led JGS staff in exercises in determining how much territory ARVN could defend with varying amounts of U.S. aid. He also began planning independent military operations to cope with the effects of Vietnamization. Although Gen. William B. Rosson met with him in April 1970 to warn against it, Viên began planning for ARVN troops to engage in cross-border attacks into Cambodia to strike at Viet Cong and PAVN staging and supply areas. He also reorganized the ARVN command structure, providing for joint command of III and IV Corps while operating inside Cambodia and the establishment of a Cambodian military liaison officer to the JGS.
At a high-level meeting of cabinet officials and generals in October 1970, Viên again sought and won support for a plan (Operation Lam Son 719) to send ARVN troops into Laos to cut the Ho Chi Minh Trail. Viên and President Thiệu met with United States Secretary of Defense Melvin R. Laird on January 11, 1971, and proposed their plan. With Laird's tentative approval, Viên met with Gen. Creighton Abrams and worked out the military details. Viên had proposed an invasion of Laos "countless" times since 1965, making it one of his top strategic goals. But the invasion was a disaster. Poor roads, rough terrain, and a much higher than expected number of PAVN artillery and machine gun positions (which interdicted airborne resupply efforts) brought the invasion to a halt halfway to its intended target of the city of Tchepone by the first of March. A worried Viên met with Gen. Abrams, President Thiệu, and U.S. Ambassador Ellsworth Bunker on March 3 to discuss a change in tactics, and concluded that ARVN airborne forces would make an assault on the abandoned town of Tchepone and occupy it. The assault was successful, and two days later a withdrawal began. The withdrawal turned into an undisciplined, panicked retreat with very heavy losses which was completed on April 6, 1971.
In an example of what he called "pure psywar", Viên also spread rumors that ARVN troops might invade across the Vietnamese Demilitarized Zone and invade North Vietnam (rumors intended to keep three PAVN brigades pinned down there). General Viên met with U.S. Secretary of Defense Laird, Chairman of the Joint Chiefs of Staff Admiral Thomas H. Moorer, and Commander-in-Chief, Pacific Command (CINCPAC) Admiral John S. McCain, Jr. in November 1971 to discuss the effect of military aid cuts.
General Viên's role as Chief of JGS became more advisory after 1971. After PAVN's success during the early months of the Easter Offensive in March and April 1972—during which the city of Quảng Trị and the provinces of Bình Định and Kon Tum were lost to communist forces—President Thiệu consulted with Gen. Viên but continued to personally direct the war without general staff assistance. Viên still believed ARVN capable of defeating the insurgents if his military forces were given enough supplies. As the Easter Offensive ended in October, speculation was rife that the Thiệu government might not be able to survive. Viên was among the individuals who South Vietnamese and American officials felt might be able to form a coalition government with the Viet Cong, if such an action were necessary.
Gen. Viên nearly became a signatory to the Paris Peace Accords in 1973. A tentative agreement between the United States and North Vietnam was reached in late October 1972, but President Thiệu rejected the accord and demanded 69 changes. Concerned that the Hanoi government might pull out of the negotiations altogether and seek to defeat the South Vietnamese, President Nixon ordered the heavy aerial bombing (Operation Linebacker II) of North Vietnam in December 1972. Although American losses were light overall and damage in North Vietnam heavy, American public opinion and Congressional anger ran high against the bombing campaign. The Hanoi government agreed to return to the bargaining table, and Nixon suspended operations against North Vietnam on December 29, 1972. Nixon offered repeated, private assurances (which did not have the weight of formal diplomatic guarantees) to President Thiệu several times during the first two weeks of January, but could not get him to agree to sign the peace document. When President Thiệu continued to balk, Nixon told him that he would independently sign the peace accord on January 23 with or without South Vietnamese consent. Thiệu capitulated. By January 22, however, it was unclear if Thiệu would actually send a delegate to Paris to sign the documents. Gen. Viên offered to go to Paris to initial the peace agreement without Thiệu's consent, but President Nixon vetoed the idea.
General Viên was the most senior South Vietnamese official to represent the government as General Frederick C. Weyand and the final contingent of U.S. ground troops left Vietnam on March 28, 1973.
Viên ordered heightened security for the 1974 Tết holiday, and in April 1974 traveled to the United States to plead (unsuccessfully) for more military aid. He was appointed a member of the Presidential Military Council in 1975 along with generals Trần Thiện Khiêm and Dạng Văn Quảng. He also promoted Lt. Gen. Đổng Văn Khuyên, a close friend and Commander of the Central Logistics Command, to act concurrently as Chief of Staff of the JGS. In the opinion of Major General Homer D. Smith, the U.S. defense attaché, Khuyên's appointment enhanced operations and personnel operations while diminishing the managerial efficiency of logistics and creating jealousy among other military commanders.
Role during government's final days
Viên was present at the fateful meeting in March 1975 which led to South Vietnam's collapse. At the end of February 1975, President Thiệu (accompanied by Gen. Viên and Prime Minister Gen. Trần Thiện Khiêm) made a brief visit to Cam Ranh Bay to assess the military situation in South Vietnam's northernmost military zone. At an assembly of top generals on March 11, 1975, President Thiệu declared he would abandon the Central Highlands—trading land in order to achieve a more defensible concentration of population and troops around Saigon and the Mekong Delta. Although he had long believed such a move was necessary, Viên did not speak up in support of any such plan until this meeting. Yet, he also did not voice his belief that the war was unwinnable if the Central Highlands were abandoned. Accounts of this meeting do differ, however. Some versions of the meeting have Viên remaining silent at Thieu's decision. Whichever version is correct, the government did not prepare the army, its allies, or the public for the decision, nor did it anticipate how the decision might affect the war effort. Although Gen. Viên met with Maj. Gen. Homer D. Smith shortly after the March 11 meeting, he did not inform him about President Thiệu's decision—leaving the Americans unprepared for what followed. Thiệu's decision led to widespread panic among the public, and the collapse of the Army of the Republic of Vietnam. As panic set in and ARVN troops refused to fight or deserted in large numbers, Gen. Viên tried to rally his nation's troops: "We have only one way and that is to fight for our survival. The historic hour has come." But privately he expressed his belief that the Thiệu government could no longer prosecute the war effort effectively. General Viên, President Thiệu, Vice President Trần Văn Hương, and Prime Minister Gen. Trần Thiện Khiêm consulted with Gen. Weyand (visiting South Vietnam on a fact-finding mission) on April 1. Also present were U.S. Ambassador Graham Martin and Maj. Gen. Homer D. Smith. Weyand delivered a personal message from President Gerald Ford indicating that limited amounts of critical supplies and equipment were coming, but that the South Vietnamese army had to hold its ground.
General Viên met with Gen. Trần Văn Đôn, the new South Vietnamese Defense Minister, on April 16 and advised him that ARVN troops would no longer fight. To Australian Army Brigadier Ted Serong, this was a sign that Gen. Viên himself was abandoning the fight. But Maj. Gen. Homer D. Smith felt that Viên and the JGS staff were working very hard to reconstitute forces which had fled and wanted to continue to fight. On April 21, Gen. Viên issued a statement that said he would not resign and intended to stay and fight. On April 27, Viên helped brief members of the National Assembly on what was likely to happen once the city fell. Air Marshal Nguyễn Cao Kỳ later said he called Gen. Viên on April 27 and offered to lead a tank column so that they could open the road to the west and help tens of thousands of people flee the city, but Gen. Viên dissuaded him. Viên's next actions are unclear. Some accounts say that Gen. Viên then resigned, telling President Trần Văn Hương that he could not serve under Gen. Dương Văn Minh (who had returned to the country in 1968 and would be named President on April 27). But other versions of the fall of Saigon have Gen. Viên leaving Vietnam on April 28 without resigning, leaving the JGS in turmoil.
Saigon fell to PAVN forces on April 30, 1975.
Assessments of Cao Văn Viên's military career are generally positive. In his memoir, A Soldier Reports, Gen. William Westmoreland concluded, "Never have I known a more admirable man: honest, loyal, reserved, scholarly, diplomatic." Historians have said his strategic and command skills compared favorably with those of American General Earle G. Wheeler, and that Gen. Creighton Abrams respected Viên deeply. Maj. Gen. Homer D. Smith said, "I was most impressed with this gentleman. Our relationship was one of complete candor on the matters he chose to discuss. ... I never heard him say an unkind thing about anyone. Despite the obvious facts of too little support and and the failing prospects of getting more support, he was never bitter. He was a very gracious person." In a top secret report in July 1970, Colonel John K. Singlaub said he had "a very warm personal working relationship" with Viên, and described the general as a "major factor in getting things done".
There are some critics, however. General Lâm Quang Thi called him a "colorless" man who preferred practicing yoga over leading troops. Los Angeles Times reporter George McArthur called him "something of a prima donna." Nguyễn Tiến Hưng described him as "a mediocre staff officer, without imagination."
Cao Văn Viên left Vietnam for the United States on April 28, 1975. He arrived in America on April 29, 1975, aboard a C-141 Starlifter aircraft which landed at El Toro Marine Air Station. He was met by Marine Brigadier General R. W. Taylor and taken to an undisclosed location before being reunited with his family. The Viên family had strong ties to the U.S. already: In 1973, Gen. Viên's oldest son was a doctoral student at American University and his second-oldest son was attending high school in Washington, D.C.
The Viên family settled briefly in New Jersey, where his wife Tran Thi Tao ran a dry cleaning business. The Viên family then moved to Falls Church, Virginia, His wife started an export-import business. For a time, Gen. Viên was paid $1,500 by the U.S. Army to write monographs about the conduct of the Vietnam War. His most comprehensive analysis was The Final Collapse, in which he argued that cutbacks in military assistance and a lack of U.S. air power led to the defeat of the South Vietnamese government. After finishing his work for the U.S. Army, Gen. Viên considered teaching French literature, but he suffered from rheumatoid arthritis and was unable to work. Viên was a lifelong adherent of Buddhism; fluent in English, French, and Laotian; never smoked or drank; and loved birds. He became an American citizen in 1982. He kept bees and allowed them to sting him to dull the pain of his arthritis, but this unorthodox remedy was only temporarily effective.
Gen. Viên's wife died in 1991. His daughter, Lan Cao, became a professor of law at the College of William and Mary. His son Cao Anh Tuan died in 1996, and his son Cao Anh Dzung disappeared and has never been found. Cao Văn Viên lived his last years at Sleepy Hollow Manor, an assisted living facility in Annandale, Virginia. He died there of cardiac arrest on January 22, 2008. He was survived by his daughter and five grandchildren.
Controversy over wealth
At the time that he left Vietnam, the American press believed that General Viên was one of the wealthiest generals able to escape the country. The Los Angeles Times reported that "repeated American complaints" had prevented Viên himself from accumulating wealth or engaging in corruption.
General Viên's wife, Tao Thi Tran, was the daughter of one of the largest landowners in the Mekong Delta. Her father was executed by the Viet Cong and her family's land confiscated. A savvy businesswoman, she built a large number of businesses while her husband was in the military. She owned and ran bars and hotels that catered to U.S. military personnel and diplomats, owned and operated a Pepsi-Cola bottling franchise, owned a San Miguel beer distributorship, owned a large construction company that built 20 to 30 homes each year, owned extensive tracts of land, and ran an export-import business which specialized in Vietnamese handicrafts. She was also said to sell favors and military and political promotions.
Accusations were also frequently made that General Viên's wife had enriched the family due to her husband's position, although there was almost no evidence to support such claims. In September 1970, a member of the National Assembly accused Gen. Viên of extensive corruption. After the fall of Saigon, Nguyễn Văn Ngái (a former Minister of Rural Development and former Senator in the National Assembly) also accused the Viêns of corruption. Another unsubstantiated claim was that the Viêns had deposited $1 million in a bank in Guam during their flight from South Vietnam.
In addition to his National Order of Vietnam, Silver Star, and Legion of Merit, General Viên was awarded eight other medals from the governments of the Philippines, the Republic of China, South Korea, and Thailand. He also received the following honors from the Republic of Vietnam as of 1967:
- Army Distinguished Service Order, 1st class
- Air Force Order, 1st class
- Navy Distinguished Service Order, 1st class
- Gallantry Crosses (12 Citations: eight with Palm, two with Silver Star, two with Brass Star)
- Air Gallantry Medal (Golden Wing)
- Hazardous Service Medal
- Tucker, Spencer, ed. Encyclopedia of the Vietnam War: A Political, Social, and Military History Santa Barbara, Calif.: ABC-CLIO, 1998. ISBN 0-87436-983-5
- Butterfield, Fox. "The Communists Were Stunned, Too" The New York Times May 12, 1985
- Holley, Joe. "Cao Van Vien, South Vietnam 4-Star General" The Washington Post January 30, 2008
- Moyar, Triumph Forsaken: The Vietnam War, 1954-1965, 2006, p. 267.
- Smith, Philip. "Key Vietnam Army Figure Becomes Citizen" Washington Post January 20, 1982
- Sorley, A Better War: The Unexamined Victories and Final Tragedy of America's Last Years in Vietnam, 2007, p. 364.
- Dawson, Alan 55 Days: The Fall of South Vietnam New York: Prentice-Hall, 1978. ISBN 0-13-314476-3
- Who's Who In Vietnam Saigon: Vietnam Press, 1967.
- Westmoreland, William Childs A Soldier Reports New York: Doubleday, 1976. ISBN 0-385-00434-6
- Tuohy, William. "New Defense Minister for S. Vietnam Named", Los Angeles Times January 28, 1967.
- Lam, Quang Thi The Twenty-Five Year Century: A South Vietnamese General Remembers the Indochina War to the Fall of Saigon Denton, Texas: University of North Texas Press, 2001. ISBN 1-57441-143-8
- Nguyen, Van Tin and Battreall, Raymond R. Major General Nguyen Van Hieu, ARVN: A Revealing Insight of the ARVN and a Unique Perspective of the Vietnam War San Jose, California: Writers Club Press, 2000. ISBN 0-595-00696-5
- One source lists his roles and ranks as follows:
- First Lieutenant, Deputy Head of Administrative Section, Defense Ministry, 1951
- Chief, Press and Information Section, Defense Ministry, 1951
- Captain, G2 Chief for Hung Yen Field Force, 1953
- Commander, 10th Battalion, 1953
- Chief of Staff, Hung Yen Field Force, 1953
- Major, G2 Chief for III Military Region, 1954
- G4 Chief for III Military Region, 1954
- Commander, 56th Battalion, 1954
- St. George, Donna. "Cao Van Vien, 1921-2008" Washington Post January 2, 2009
- Kinnard, Douglas The War Managers: American Generals Reflect on Vietnam Reprint ed. Cambridge, Mass.: Da Capo Press, 1991. ISBN 0-306-80449-2
- Hammer, pp. 125–132.
- Hamilton, Donald W. The Art of Insurgency: American Military Policy and the Failure of Strategy in Southeast Asia Santa Barbara, California: Greenwood Publishing Group, 1998. ISBN 0-275-95734-9
- Moyar, Mark Triumph Forsaken: The Vietnam War, 1954-1965 New York: Cambridge University Press, 2006. ISBN 0-521-86911-0
- Halberstam, David and Singal, Daniel Joseph The Making of a Quagmire: America and Vietnam During the Kennedy Era Rev. ed. New York: Rowman & Littlefield, 2008. ISBN 0-7425-6008-2
- Jones, p. 408.
- Moyar, p. 267.
- Hung, p. 79.
- Hung, Nguyen Tien and Schecter, Jerrold L. The Palace File New York: Harper & Row, 1986. ISBN 0-06-015640-6
- Smith, Hedrick. "4 Generals Held", New York Times January 30, 1964; Smith, Hedrick. "New Saigon Chief Tightening His Rule' New York Times January 31, 1964; "New Viet Coup" United Press International January 30, 1964
- Grose, Peter. "U.S. Rallies to Khanh", New York Times March 15, 1964.
- Nguyễn, Cao Kỳ and Wolf, Marvin J. Buddha's Child: My Fight to Save Vietnam New York: Macmillan, 2002. ISBN 0-312-28115-3
- Nguyễn, Văn Dương The Tragedy of the Vietnam War: A South Vietnamese Officer's Analysis Jefferson, N.C.: McFarland, 2008. ISBN 0-7864-3285-3
- "South Vietnamese General Receives U.S. Silver Star", Associated Press May 13, 1967.
- Apple, Jr., R. W. "Vietcong Hunter After Big Airdrop", New York Times September 16, 1965.
- As of April 1968, he was still the only senior officer to be so wounded. See: Tuohy, William. "S. Viet Chief of Staff Reported to Have Quit", Los Angeles Times April 4, 1968.
- "Viet Coup Rumor", Associated Press; September 12, 1964
- "Khanh Dismisses Three" United Press International September 12, 1964
- Grose, Peter. "Khanh, Back at the Helm, Lauds Younger Officers", New York Times September 15, 1964; "Reform Demands Handed to Khanh", Los Angeles Times September 15, 1964.
- "Saigon Troops Guard Against Coup", Los Angeles Times September 28, 1964
- "Dissidents Offer to Mediate" United Press International. December 21, 1964.
- Foisie, Jack. "Biggest Copter Attack of Viet War Launched", Los Angeles Times February 28, 1965
- Langguth, Jack. "Mortars Open Attack", New York Times June 11, 1965; Associated Press The World in 1965 New York: Associated Press, 1966; "Perspective", Los Angeles Times June 13, 1965; Esper, George The Eyewitness History of the Vietnam War, 1961-1975 New York: Ballantine Books, 1983. ISBN 0-345-30865-4; Maitland, Terrence and McInerney, Peter Contagion of War (1965-1967): The Vietnam Experience Boston: Boston Publishing Company, 1983. ISBN 0-7881-9445-3
- "New Viet Premier", Los Angeles Times June 19, 1965
- Apple, Jr., R. W. "Ky Vows to Help Rural Vietnam", New York Times October 2, 1965
- Apple, Jr., R. W. "Diem's Downfall Marked in Saigon", New York Times November 2, 1965.
- Spencer Tucker Vietnam 1999 p117 "In 1965 ARVN General Cao Văn Viên suggested fortifying a zone .."
- "Saigon Command Affirms Decision on Jan. 21-24 Truce", New York Times January 13, 1966
- Isaacs, Arnold R. Without Honor: Defeat in Vietnam and Cambodia Baltimore: Johns Hopkins University Press, 1999. ISBN 0-8018-6107-1
- Smith, Homer D. "End of Tour/End of Mission Report" Residual Defense Attaché Office, Saigon. May 30, 1975. Accessed 2010-02-15.
- Schreadley, Richard L. "From the Rivers to the Sea: The United States Navy in Vietnam Annapolis, Md.: Naval Institute Press, 1992. ISBN 0-87021-772-0
- Tuohy, William. "S. Viet Chief of Staff Reported to Have Quit", Los Angeles Times April 4, 1968.
- Fulghum, David and Maitland, Terrence South Vietnam on Trial, Mid-1970 to 1972 Boston: The Company, 1984. ISBN 0-939526-10-7
- Isaacs, Without Honor: Defeat in Vietnam and Cambodia, 1999, p. 124.
- Smith, "End of Tour/End of Mission Report", May 30, 1975, p. 13.
- Tuohy, William. "Ky Replaces Three Cabinet Ministers In South Vietnam", Los Angeles Times November 17, 1966
- Tuohy, William. "Ky Cuts Power of Generals in Shuffle", Los Angeles Times November 20, 1966
- "Saigon General Discounts Value of Raids on North", New York Times August 11, 1967
- Prados, John The Blood Road: The Ho Chi Minh Trail and the Vietnam War Reprint ed. Indianapolis, Ind.: Wiley, 1999. ISBN 0-471-25465-7
- Colvin, John Volcano Under Snow: Vo Nguyen Giap London: Quartet Books, 1996. ISBN 0-7043-7100-6; "Talking—and Killing—Go On", Los Angeles Times October 6, 1968
- Wiest, Andrew A. Rolling Thunder in a Gentle Land: The Vietnam War Revisited Westminster, Maryland.: Osprey Publishing, 2006. ISBN 1-84603-020-X
- "Invade North, Viet Military Chief Urges" United Press International; September 27, 1968; Tuohy, William. "S. Viet General Gives Details of Barrier Plan", Los Angeles Times October 3, 1968
- Eckhardt, George S. Command and Control, 1950-1969 Washington, D.C.: U.S. Department of the Army, 1974; "Saigon Names Navy Head" Reuters; September 16, 1966
- Tuohy, William. "Saigon General Charges: U.S. Aides Meddle", Los Angeles Times December 9, 1966; Tuohy, William. "Viet Adviser Rift Feared Spreading", Los Angeles Times December 11, 1966
- Randal, Jonathan. "Vietnam's Army: Sometimes It Only Seems to Fight", New York Times June 11, 1967
- Apple, Jr., R. W. "South Vietnam's Armed Forces Cut Desertions", New York Times May 5, 1967
- Topmiller, Robert J. The Lotus Unleashed: The Buddhist Peace Movement in South Vietnam, 1964-1966 Lexington, Kentucky: University Press of Kentucky, 2006. ISBN 0-8131-9166-1; Foisie, Jack. "Da Nang Peace Snag Seen in Generals' Rift", Los Angeles Times April 8, 1966; Sheehan, Neil. "Fight Lasts A Day", New York Times May 16, 1966; Sheehan, Neil. "Danang Monks Threaten Suicide If Attacked", New York Times May 17, 1966; Alsop, Joseph. "Among Viet Gains, List Successes of Gen. Ky", Los Angeles Times September 13, 1966.
- Tuohy, William. "U.S. Taking Steps to Avoid Bombing Vietnam Civilians", Los Angeles Times August 25, 1966.
- "Generals Check on Reports", Associated Press; June 20, 1968; "U.S. Probes Possibility Reds Use Copters to Haul Styx Missiles", Los Angeles Times June 20, 1968
- Randal, Jonathan. "Premier Ky Back From Trip Abroad", New York Times January 27, 1967; Tuohy, William. "Ky Returns to Saigon, OKs General's Ouster", Los Angeles Times January 27, 1967; Randal, Jonathan. "Chief of Defense Named By Saigon", New York Times January 28, 1967.
- "Ky Reported Ready to Oust 5 More Generals", Associated Press; February 6, 1967.
- McArthur, George. "Vietnamese Spurned Graft", Los Angeles Times August 31, 1975
- Szulc, Tad. "Saigon Curbs on U.S. Press Disturb Pentagon", New York Times February 1, 1970
- Blair, Anne E. There to the Bitter End: Ted Serong in Vietnam Crows Nest, Australia: Allen & Unwin, 2001. ISBN 1-86508-468-9
- Tucker, Spencer Vietnam Florence, Ky.: Routledge, 1999. ISBN 1-85728-922-6
- Werner, Jayne and Luu, Doan Huynh The Vietnam War: Vietnamese and American Perspectives Armonk, NY: M.E. Sharpe, 1994. ISBN 1-56324-131-5
- Tuohy, William. "Ky Announces He Will Run for Presidency", Los Angeles Times May 12, 1967
- Randolph, John. "Ky Drops His Presidential Bid, Takes 2nd Spot on Thieu Slate", Los Angeles Times July 1, 1967
- FitzGerald, Frances Fire in the Lake: The Vietnamese and the Americans in Vietnam Reprint ed. Boston: Back Bay, 2002. ISBN 0-316-15919-0
- Tuohy, William. "M'Namara Back Home After 5-Day Viet Visit", Los Angeles Times July 12, 1967
- Tuohy, William. "Viet Military Won't Put Candidate in Election", Los Angeles Times May 10, 1967
- Diem, Bui and Chanoff, David In the Jaws of History Bloomington: Indiana University Press, 1999. ISBN 0-253-21301-0; McNeill, Ian and Ekins, Ashley On the Offensive: The Australian Army in the Vietnam War, January 1967-June 1968 Crows Nest, Australia: Allen & Unwin, 2003. ISBN 1-86373-304-3; "South Viet Nam: Thieu on Top" Time July 7, 1967; Apple, Jr., R. W. "Ky's Political Plans", New York Times May 10, 1967.
- Apple, Jr., R. W. "Junta in Saigon Drawing Up Plan to Retain Power", New York Times August 2, 1967
- Tuohy, William. "Viet Junta Pushes Ky Candidacy", Los Angeles Times April 23, 1967.
- "Power Struggle", Los Angeles Times June 30, 1967.
- Gibbons, William Conrad The U.S. Government and the Vietnam War: Executive and Legislative Roles and Relationships Princeton, NJ: Princeton University Press, 1995. ISBN 0-691-00635-0
- For three decades, historians believed that the bombing raids had been few, irregular, and limited to border areas until the implementation of Operation Menu by the United States Air Force between March 1969 and May 1970. See: Chandler, David P. The Tragedy of Cambodian History: Politics, War, and Revolution Since 1945 Reprint ed. New Haven, Conn.: Yale University Press, 1993. ISBN 0-300-05752-0 However, in 2000, newly declassified American military documents revealed that the secret bombing of Cambodia had been extensive, frequent, and heavy since at least 1965 and had ranged over nearly the entire country. See: Owen, Taylor and Kiernan, Bob. "Bombs Over Cambodia" The Walrus October 2006; Young, Marilyn Blatt and Buzzanco, Robert A Companion to the Vietnam War Indianapolis: Wiley-Blackwell, 2006. ISBN 1-4051-4983-3; Nalty, Bernard C. Air War Over South Vietnam, 1968-1975 Washington, D.C.: Department of the Air Force, 2001. ISBN 0-16-050914-9
- "No Flights Over Cambodia" United Press International. August 11, 1967.
- Tuohy, William. "50 S. Viet Army Officers Charged With Corruption", Los Angeles Times August 26, 1967
- Apple, Jr., R. W. "Thieu Said to Plan A Civilian Cabinet", New York Times October 12, 1967
- Nguyen, Phu Duc The Viet Nam Peace Negotiations: Saigon's Side of the Story Christiansburg, Va.: Dalley Book Service, 2005. ISBN 0-923135-82-0
- Davidson, Phillip B. Vietnam at War: The History, 1946-1975 New York: Oxford University Press US, 1991. ISBN 0-19-506792-4
- Apple, Jr., R. W. "Johnson Backs Military Leaders More Firmly Than Ever in Vietnam Visit", New York Times December 24, 1967
- Lind, Michael Vietnam, the Necessary War: A Reinterpretation of America's Most Disastrous Military Conflict New York: Simon and Schuster, 1999. ISBN 0-684-84254-8
- Anderson, David L. The Columbia Guide to the Vietnam War New York: Columbia University Press, 2002. ISBN 0-231-11493-1
- Tuohy, William. "Ky's Army Switches to Pacification Role", Los Angeles Times November 6, 1966
- Mohr, Charles. "High Saigon Aide Likely to Get Job of Revitalizing the Military", New York Times September 26, 1967
- Vietnam was organized into four military zones, and each Corps was assigned a zone. A hierarchical political system of local village leaders, district chiefs, and provincial chiefs existed, with the local and provincial political systems reporting to military rather than political/civilian leaders. Except for village leaders and the national Assembly, most political leaders were appointed by the Corps commanders rather than elected. See: Tuohy, William. "Ky Replaces Three Cabinet Ministers In South Vietnam", Los Angeles Times November 17, 1966; Goodman, Allan E. Politics in War: The Bases of Political Community in South Vietnam Cambridge, Mass.: Harvard University Press, 1973. ISBN 0-674-68825-2
- Mohr, Charles. "Thieu Is Delaying Reform of Army", New York Times January 13, 1968
- "Saigon General Quits the Army", Associated Press; January 27, 1968
- Tuohy, William. "Saigon Military Shifts Show Lack of Leaders", Los Angeles Times February 29, 1968
- Randolph, John. "Saigon Cabinet List Wins Public Approval", Los Angeles Times November 9, 1967
- Arnold, James R. Tet Offensive 1968: Turning Point in Vietnam Westminster, Md.: Osprey Publishing, 1990. ISBN 0-85045-960-5
- Karnow, Stanley Vietnam: A History New York: Penguin, 1991. ISBN 0-670-84218-4
- Oberdorfer, Don Tet!: The Turning Point in the Vietnam War Baltimore: Johns Hopkins University Press, 2001. ISBN 0-8018-6703-7
- Willbanks, James H. The Tet Offensive: A Concise History New York: Columbia University Press, 2008. ISBN 0-231-12841-X
- Woodruff, Mark W. and Jones, James L. Unheralded Victory: The Defeat of the Viet Cong and the North Vietnamese Army, 1961-1973 Reprint ed. New York: Random House, Inc., 2005. ISBN 0-89141-866-0
- Tucker, p. 62.
- Shulimson, Jack U.S. Marines in Vietnam: The Defining Year, 1968 Washington, D.C.: History and Museums Division, Headquarters, U.S. Marine Corps, 1997. ISBN 0-16-049125-8
- "Allies Disagree on Enemy's Aims", New York Times February 24, 1968
- The Americans would abandon Khe Sanh by June 1968. See: Krulak, Victor H. First to Fight: An Inside View of the U.S. Marine Corps Annapolis, Md.: Naval Institute Press, 1999. ISBN 1-55750-464-4; Pisor, Robert The End of the Line: The Siege of Khe Sanh Reprint ed. New York: W. W. Norton & Company, 2002. ISBN 0-393-32269-6
- "U.S. Aide's Speech Is A Boon to Thieu", New York Times April 15, 1968
- Weinraub, Bernard. "Head of South Vietnam's Forces Quits Amid Reports of Shake-Up", New York Times April 4, 1968
- "Top General Denies He Has Quit", New York Times April 6, 1968
- Roberts, Gene. "Ky Urges Support for Thieu Regime", New York Times June 18, 1968
- A RAND Corporation study in 1978 quoted an unnamed South Vietnamese general to provide a possible explanation: "President Thieu had in his mind all the time the fear of a coup against himself, and he was very happy to have General Cao Van Vien, a very quiet man, a not very exciting man, to be chief of staff. And Thieu also liked not to see close cooperation between the General Staff and the four Corps Headquarters. ... He was all the time afraid of a government by the generals. (He did not even want them to meet with each other.) He had in mind that if all these people [got] together to talk about the military situation, they would also discuss the political situation and make a coup." See: Hosmer, Kellen, and Jenkins, The Fall of South Vietnam, 1978, p. 23.
- "Saigon Shake-Up" United Press International. May 18, 1968.
- Lescze, Lee. "Huong, Aides Consulting on Viet Cabinet", Los Angeles Times May 20, 1968
- Mohr, Charles. "Thieu Seeks U.S. Pledges At Meeting With Johnson", New York Times July 20, 1968
- "Thieu Goes on Korean, Taiwan Trip", Associated Press; May 27, 1969
- Cao, Văn Viên The Final Collapse Paperback ed. Honolulu: University Press of the Pacific, 2005. ISBN 1-4102-1955-0
- Sorley, Lewis Vietnam Chronicles: The Abrams Tapes, 1968-1972 Lubbock, Texas: Texas Tech University Press, 2004. ISBN 0-89672-533-2
- Dinh, Tho Tran The South Vietnamese Society Washington, D.C.: U.S. Army Center of Military History, 1980
- "Red Gunners, Evading Allied Sweep, Shell Southern Saigon", Associated Press; June 15, 1968
- Menzel, Sewall Battle Captain Bloomington, Indiana: AuthorHouse, 2006. ISBN 1-4259-8424-X; Smith, Hedrick. "Disengagement vs. Survival", New York Times December 29, 1968
- Randolph, John. "Rumors of Bomb Halt Sweep Official Saigon", Los Angeles Times October 17, 1968
- "U.S. Withdrawals Discussed", New York Times January 21, 1969; "Summer Start Seen for Viet Troop Pullout", Associated Press February 8, 1969
- Ayres, Jr., B. Drummond. "South Vietnamese Troops Showing Uneven Progress", New York Times June 2, 1969
- Dommen, Arthur J. "Viet Officers Skeptical About Camp Transfers", Los Angeles Times March 22, 1970
- Smith, Hedrick. "Nixon to Reduce Vietnam Force, Pulling Out 25,000 G.I.'s By Aug. 31", New York Times June 9, 1969
- "U.S. Turns Over 64 River Patrol Gunboats to South Vietnamese Navy", New York Times June 26, 1969.
- Sorley, Lewis A Better War: The Unexamined Victories and Final Tragedy of America's Last Years in Vietnam Reprint ed. New York: Houghton Mifflin Harcourt, 2007. ISBN 0-15-601309-6
- "General Order No. 8. Legion of Merit Awards - VI." Headquarters. Department of the Army. December 4, 1969
- Smith, Terrence. "Vietnam: This Visit, the Topic Is: 'How to Get Out?'", New York Times February 15, 1970
- Hosmer, Stephen T.; Kellen, Konrad; and Jenkins, Brian AVI. The Fall of South Vietnam: Statements by Vietnamese Military and Civilian Leaders R-2208-OSD (HIST). Report prepared for Historian, Office of the Secretary of Defense, United States Department of Defense. December 1978. Accessed 2010-02-27. According to this study, all four Corps areas could be held with $1.5 billion in aid per year, but only I and II Corps areas could be held with $700 million a year. See: p. 8.
- Dommen, Arthur J. The Indochinese Experience of the French and the Americans: Nationalism and Communism in Cambodia, Laos, and Vietnam Bloomington, Indiana: Indiana University Press, 2001. ISBN 0-253-33854-9
- "Thai Premier Visits Vietnam" Reuters. June 20, 1970.
- Coughlin, William J. "Viet, Cambodia Military Leaders Set Up Liaison", Los Angeles Times June 1, 1970
- Blumenthal, Ralph. "Thieu Ends Parley, but Saigon Gives No Details", New York Times October 26, 1970
- Shuster, Alvin. "Plan to Cut Enemy's Lines in Laos, Long Rejected, Was Revived 3 Months Ago", New York Times February 9, 1971
- McArthur, George. "Laos Invasion Seen Aborted by Last-Minute Washington Doubts", Los Angeles Times February 7, 1971; McArthur, George. "Despite Borders, War Seems Destined to Fill All Indochina", Los Angeles Times February 7, 1971
- Nolan, William K. Into Laos: The Story of Dewey Canyon II/Lam Son 719 Novato, Calif.: Presidio Press, 1986. ISBN 0-89141-247-6
- McArthur, George. "Epic Battle Possible in South Laos", Los Angeles Times March 4, 1971
- Kamm, Henry. "Invasion Rumor Spreads in Saigon", New York Times February 28, 1971
- "Laird Sure Foreign Aid Cuts Will Be Restored" United Press International. November 4, 1971.
- Whitney, Craig R. "Pessimism in Saigon", New York Times May 3, 1972; "N. Viet Invasion Stalls as Allies Launch Huge Counteroffensive", Associated Press; April 4, 1972
- Butterfield, Fox. "Kissinger Confers with Thieu 2d Day", New York Times October 21, 1972; "Saigon Official Says Thieu Prepares Plans for Truce", New York Times October 23, 1972
- Gettleman, Marvin E. Vietnam and America: A Documented History 2d rev. ed. New York: Grove Press, 1995. ISBN 0-8021-3362-2; Donaldson, Gary America at War Since 1945: Politics and Diplomacy in Korea, Vietnam, and the Gulf War Santa Barbara, Calif.: Greenwood Publishing Group, 1996. ISBN 0-275-95660-1
- Rasiumus, Ed. Palace Cobra: A Fighter Pilot in the Vietnam Air War New York: Macmillan, 2006. ISBN 0-312-35356-1; Clodfelter, Mark The Limits of Air Power: The American Bombing of North Vietnam 29th ed. New York: Simon and Schuster, 1989. ISBN 0-02-905990-9; McCarthy, James R.; Allison, George B.; and Rayfield, Robert E. Linebacker II: A View From the Rock Washington, D.C.: Office of Air Force History, U.S. Air Force, 1985. ISBN 0-912799-31-5
- Ambrose, Stephen E. "The Christmas Bombing" In The Cold War: A Military History Robert Cowley, ed. New York: Random House, 2005. ISBN 0-8129-6716-X; Lipsman, Samuel; Weiss, Stephen, Dougan, Clark; and Fulghum, David The False Peace: 1972–74 Boston: Boston Publishing Company, 1985. ISBN 0-939526-15-8
- McArthur, George. "America's Last Farewell to Vietnam—Some Even Cried", Los Angeles Times March 29, 1973
- "Thieu Calls for Tight Security", New York Times January 8, 1974
- Elegant, Robert S. "The Vietnam Debacle—Treachery, Greed, Brutality", Los Angeles Times April 24, 1975
- Lee, J. Edward and Haynsworth, Toby Nixon, Ford, and the Abandonment of South Vietnam Jefferson, NC: McFarland, 2002. ISBN 0-7864-1302-6
- Butterfield, Fox. "Hanoi Aide Cites Key Thieu 'Error'", New York Times April 29, 1976
- "Secret Viet Talks Reported" United Press International. March 19, 1975.
- Kolko, Gabriel Anatomy of a War: Vietnam, the United States, and the Modern Historical Experience New York : Pantheon Books, 1985. ISBN 0-394-53874-9
- Gibson, James William The Perfect War: Technowar in Vietnam New York: Atlantic Monthly Press, 2000. ISBN 0-87113-799-2; Dooley, George E. Battle for the Central Highlands: A Special Forces Story New York: Random House, 2000. ISBN 0-8041-1939-2; Kissinger, Henry Years of Renewal New York: Simon and Schuster, 2000. ISBN 0-684-85572-0
- "Saigon Senate Turns on Thieu", Los Angeles Times April 2, 1975; "Battle Rages Only 38 Miles From Saigon", Los Angeles Times April 3, 1975
- Browne, Malcolm W. "Thieu Is Reported Ready to Act On Generals Who Gave Ground", New York Times April 6, 1975
- "Reds Take Over 2 More Capitals", Los Angeles Times April 2, 1975
- McArthur, George. "Weyand's Hard-Nosed Message", Los Angeles Times April 3, 1975
- "Thieu's Wife Reported to Have Left Vietnam", New York Times April 22, 1975; Butterfield, Fox. "Thieu, Day After Speech, Reported Still in Charge", New York Times April 23, 1975
- Browne, Malcolm W. "Vote By Assembly", New York Times April 28, 1975
- Sterba, James P. "Captain Midnight Becomes Civilian Ky", New York Times January 11, 1976
- President Thiệu had resigned on April 21, 1975. See: Browne, Malcolm W. "10-Year Rule Ends", New York Times April 22, 1975
- Butler, David The Fall of Saigon: Scenes From the Sudden End of a Long War New York: Simon and Schuster, 1985. ISBN 0-671-46675-5; Goodman, Allen E. Politics in War: The bases of Political Community in South Vietnam Cambridge, Mass.: Harvard University Press, 1973. ISBN 0-674-68825-2
- Turley, William S. The Second Indochina War: A Concise Political and Military History 2d ed. New York: Rowman & Littlefield, 2009. ISBN 0-7425-5526-7
- Westmoreland, A Soldier Reports, 1976, p. 242.
- Smith, "End of Tour/End of Mission Report", May 30, 1975, p. 22.
- "Comments By These Interviewees On Counterpart Relationships - The Strategic Technical Directorate." Annex U to Appendix B. MACSOG Documentation Study July 10, 1970. Accessed 2010-02-27. p. B-u-13.
- McArthur, George. "Vietnam Corruption Case", Los Angeles Times April 4, 1972
- Hung and Schecter, The Palace File, 1986, p. 79.
- West, Richard. "Largest Human Airlift" Los Angeles Times April 30, 1975
- Denman, Della. "Women of Vietnam: Some Grew Strong in the Face of War", New York Times February 28, 1973
- McArthur, George. "Some Called Unsavory", Los Angeles Times May 5, 1975
- Louis, J.C. and Yazijian, Harvey The Cola Wars New York: Everest House, 1980. ISBN 0-89696-052-8; Shipler, David K. "Businessmen Flocking in to Study South Vietnam", New York Times July 10, 1973
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- McArthur, George. "Anticorruption Unit Sidesteps Viet Generals", Los Angeles Times September 13, 1970
- "Former Aide Says Thieu, Profiting by Control of Corrupt Regime, Left Vietnam a Billionaire", New York Times May 11, 1975
- "Refugee Generals Live High on Hog" United Press International. September 18, 1975.
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