Promotion to LTJG is governed by Department of Defense policies derived from the Defense Officer Personnel Management Act of 1980. DOPMA guidelines suggest all "fully qualified" ensigns should be promoted to LTJG. 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.
Lieutenant, junior grade is often referred to colloquially as JG. Prior to March 3, 1883, this rank was known in the U.S. Navy as master.[3]
Madeline Swegle, Navy Pilot The United States Navy’s first Black female tactical air pilot after 110 years of American Aviation. Madeline is the first known Black woman to be certified for the TACAIR mission, which enabled her to fly fighters like the F/A-18E/F Super Hornet, EA-18G Growler or F-35C Joint Strike Fighter.
[1] No universal insignia for officer candidate rank [2] No official insignia and not currently listed by the Army as an obtainable rank. John J. Pershing's GAS insignia: (collar) (epaulettes) [3] These ranks are reserved for wartime use only, and are still listed as ranks within their respective services [4] Grade is authorized by the U.S. Code for use but has not been created [5] Grade has never been created or authorized