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The military rank of lieutenant, in the United States Navy, United States Coast Guard, National Oceanic and Atmospheric Administration Commissioned Officer Corps (NOAA-COO), and United States Public Health Service Commissioned Corps (PHS-CC), the rank of lieutenant is divided between:

In the United States Army, Air Force, and Marine Corps is divided between:

During the American Civil War (1861-1865), brevet second lieutenants in the Union Army and Confederate States Army were sometimes also known as "third lieutenants".