Rear admiral (United States)
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A rear admiral in the uniformed services of the United States is either of two different ranks of commissioned officers: one-star flag officers and two-star flag officers. By contrast, in most other countries, the term "rear admiral" refers only to an officer of two-star rank.
Future ADM Michelle Howard when she was a U.S. Navy RDML on the USS Wasp (LHD-1) in 2009.
Captain (United States O-6)
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In the United States Navy, United States Coast Guard, United States Public Health Service Commissioned Corps (USPHS), and National Oceanic and Atmospheric Administration Commissioned Officer Corps, captain is the senior-most commissioned officer rank below that of flag officer. The equivalent rank is colonel in the United States Army, Air Force, Space Force, and Marine Corps.
U.S. Coast Guard Captain Jessica Rozzi-Ochs of USCGC Eagle, left, and U.S. Navy Commander Billie J. Farrell of USS Constitution, right, were the first female commanding officers of their respective ships.
Navy submarine captain Michael Bernacchi, serving as a chief of staff to a flag officer