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Military chocolate has been a part of standard United States military ration since the original Ration D or D ration bar of 1937. Today, military chocolate is issued to troops as part of basic field rations and sundry packs. Chocolate rations served two purposes: as a morale boost, and as a high-energy, pocket-sized emergency ration. Military chocolate rations are often made in special lots to military specifications for weight, size, and endurance. The majority of chocolate issued to military personnel is produced by the Hershey Company.

When provided as a morale boost or care package, military chocolate is often no different from normal store-bought bars in taste and composition. However, they are frequently packaged or molded differently. The World War II K ration issued in temperate climates sometimes included a bar of Hershey's commercial-formula sweet chocolate. But instead of being the typical flat thin bar, the K ration chocolate was a thick rectangular bar that was square at each end (in tropical regions, the K ration used Hershey's Tropical Bar formula).

When provided as an emergency field ration, military chocolate was very different from normal bars. Since it was provided as a quick emergency food source, officials initially outlined that it should not be a tempting treat that troops might eat before they needed it. But even as attempts to improve the flavor were made, the heat-resistant chocolate bars never received rave reviews. Emergency ration chocolate bars were made to be high in energy value, be easy to carry and to withstand high temperatures. Withstanding high temperatures was extremely important, since infantrymen would be outdoors, sometimes in tropical or desert conditions, with the bars in their pockets against their bodies. These conditions would make any normal chocolate bar melt within minutes.

Logan Bar or D ration

The first emergency chocolate ration bar commissioned by the United States Army was the Ration D, commonly known as the D ration. Army Quartermaster Colonel Paul Logan approached Hershey's Chocolate in April 1937, and met with William Murrie, the company president, and Sam Hinkle, the chief chemist. Milton Hershey was extremely interested in the project when he was informed of the proposal, and the meeting began the first experimental production of the D ration bar.

Colonel Logan had four requirements for the D ration Bar. The bar must:

  1. Weigh 4 ounces (112 g)
  2. Be high in food energy value
  3. Be able to withstand high temperatures
  4. Taste "a little better than a boiled potato"

Its ingredients were chocolate, sugar, oat flour, cacao fat, skim milk powder, and artificial flavoring. Chocolate manufacturing equipment was built to move the flowing mixture of liquid chocolate and oat flour into preset molds. However, the temperature-resistant formula of chocolate became a gooey paste that would not flow at any temperature.

Chief chemist Hinkle was forced to develop entirely new production methods to produce the bars. Each four-ounce portion had to be kneaded, weighed, and pressed into a mold by hand. The end result was an extremely hard block of dark brown chocolate that would crumble with some effort and was heat-resistant to 120 °F (49 °C).

The resultant bar was wrapped in aluminum foil. Three bars sealed in a parchment packet made up a daily ration and was intended to furnish the individual combat soldier with the 1,800 calories (7,500 kJ) minimum sustenance recommended each day.

Colonel Logan was pleased with the first small batch of samples. In June 1937, the United States Army ordered 90,000 D ration or "Logan Bars" and field tested them at bases in the Philippines, Panama, on the Texas border, and at other bases throughout the United States. Some of the bars even found their way into the supplies for Admiral Byrd's third Antarctic expedition. These field tests were successful, and the Army began making irregular orders for the bars.

With the onset of America's involvement in World War II after the attack on Pearl Harbor, the bars were ordered to be packaged to make them poison gas proof. The 4-ounce (112 g) bars' boxes were covered with an anti-gas coating and were packed 12 to a cardboard carton, which was also coated. These cartons were packed 12 to a wooden crate for a total of 144 bars to a crate.

Colonel Logan had specified that the D ration taste only a bit better than "a boiled potato." This last requirement was imposed to keep soldiers from snacking on their emergency rations in non-emergency situations. As a result, the D ration was almost universally detested for its bitter taste by U.S. troops, and was often discarded instead of consumed when issued.[1] Troops called the D ration "Hitler's Secret Weapon" for its effect on soldiers' intestinal tracts.[1] It could not be eaten at all by soldiers with poor dentition, and even those with good dental work often found it necessary to first shave slices off the bar with a knife before consuming.[1]

Tropical Bar

In 1943, the Procurement Division of the Army approached Hershey about producing a confectionery-style chocolate bar with improved flavor that would still withstand extreme heat for issue in the Pacific Theater. After a short period of experimentation, the Hershey company began producing Hershey's Tropical Bar. The bar was designed for issue with field and specialty rations such as the K ration, and originally came in 1-ounce (28 g) and 2-ounce (56 g) sizes . After 1945, it came in 4-ounce (112 g) D ration sizes as well.

The Tropical Bar (it was called the D ration throughout the war, despite its new appellation) had more of a resemblance to normal chocolate bars in its shape and flavor than the original D ration, which it gradually replaced by 1945. While attempts to sweeten its flavor were somewhat successful, nearly all U.S. soldiers found the Tropical Bar tough to chew and unappetizing; reports from countless memoirs and field reports are almost uniformly negative. Instead, the bar was either discarded or traded to unsuspecting Allied troops or civilians for more appetizing foods or goods. Resistance to accepting the ration soon appeared among the latter groups after the first few trades. In the Burma theater of war (CBI), the D ration or Tropical Bar did make one group of converts: it was known as the "dysentery ration", since the bar was the only ration those ill with dysentery could tolerate.[2]

In 1957, the bar's formula was changed to make it more appetizing. The unpopular oat flour was removed, 'non-fat milk solids' replaced 'skim-milk powder', 'Cocoa powder' replaced 'cacao fat' and artificial vanilla flavoring was added. It greatly improved the flavor of the bar, but it was still hard to chew.

Hershey bars

It is estimated that between 1940 and 1945, over 3 billion of the D ration and Tropical Bars were produced and distributed to soldiers throughout the world. In 1939, the Hershey plant was capable of producing 100,000 ration bars a day. By the end of World War II, the entire Hershey plant was producing ration bars at a rate of 24 million a week. For their service throughout World War II, the Hershey Chocolate Company was issued the Army-Navy "E" Award for Excellence for exceeding expectations for quality and quantity in the production of the D ration and the Tropical Bar. Their continued efforts resulted in four stars being added to their pennant signifying the five times they received this distinction.

Postwar to modern day

Production of the D ration bar was discontinued at the end of World War II. However, Hershey's Tropical Bar remained a standard ration for the United States Armed Forces. The Tropical Bar saw action in Korea and Vietnam as an element of the "Sundries" kit (which also contained toiletries), before being declared obsolete. It briefly returned to use when it was included onboard Apollo 15 in July 1971.

"Congo Bar" / Desert Bar

In the late 1980s, the US Army's Natick Labs created a new high-temperature chocolate (dubbed the "Congo Bar" by researchers) that could withstand heat in excess of 60 °C (140 °F).

During Operation Desert Shield and Operation Desert Storm, Hershey's Chocolate was the major manufacturer, shipping 144,000 bars to American troops in the southwest Asia theater. While Army spokesmen said the bar's taste was good, troop reactions were mixed and the bar was not put into full production.

Since the war ended before Hershey's stores of the experimental bar were shipped, the remainder of the production run was packaged in a "desert camo" wrapper and was dubbed the Desert Bar. It proved a brief novelty but Hershey declined to make more after supplies ran out.


  1. 1.0 1.1 1.2 Henry, Mark R. and Chappell, Mike, The Us Army in World War II (1): The Pacific, Osprey Publishing (2000), ISBN 1-85532-995-6, ISBN 978-1-85532-995-9, pp. 20-21
  2. Webster, Donovan, The Burma Road: The Epic Story of the China-Burma-India Theater in World War II, Harper-Collins (2004), ISBN 0-06-074638-6, ISBN 978-0-06-074638-4, p. 181

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