Lieutenant (junior grade) (LTJG) is a junior commissioned officer rank in the United States Navy, the United States Coast Guard, the United States Public Health Service Commissioned Corps, and the National Oceanic and Atmospheric Administration Commissioned Corps, with the pay grade of O-2.
Lieutenant, junior grade ranks above ensign and below lieutenant and is equivalent to a first lieutenant in the other uniformed services (the Army, Marine Corps and Air Force) and sub-lieutenant in the Royal Navy and the navies of many Commonwealth countries.
The time for promotion to LTJG is a minimum of two years after commissioning in the Navy or 18 months in the Coast Guard. Lieutenants, junior grade typically lead petty officers and non-rated personnel, unless assigned to small aircraft or on staff duty. A LTJG's usual shipboard billet is as a Division Officer.
Notable lieutenants (j.g.)
- Neil Armstrong, Korean War Naval Aviator and Commander, Apollo 11
- George H. W. Bush, 41st President of the United States
- Albert David, only Atlantic Fleet sailor awarded the Medal of Honor in World War II
- Henry Fonda, American film and stage actor
- L. Ron Hubbard, science fiction writer and founder of scientology
- John F. Kennedy, 35th President of the United States
- Bob Kerrey, Navy SEAL Medal of Honor recipient and U.S. Senator
- Thomas R. Norris, Navy SEAL and Medal of Honor recipient
-  10 USC 5501. Navy: grades above chief warrant officer, W–5
-  37 USC 201. Pay grades: assignment to; general rules
- Mallory, John A. (1914). Compiled Statutes of the United States 1913. 1. St. Paul: Wast Publishing Company. pp. 1062. http://books.google.com/books?id=L-Y4AAAAIAAJ.
- U.S. Navy history of LTJG George H. W. Bush
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