In the United States Navy, the United States Coast Guard, the United States Public Health Service Commissioned Corps, the National Oceanic and Atmospheric Administration Commissioned Corps, rear admiral (lower half) (RDML) is a one-starflag officer, with the pay grade of O-7. Rear admiral (lower half) ranks above captain and below rear admiral. Rear admiral (lower half) is equivalent to the rank of brigadier general in the other uniformed services, and equivalent to the rank of commodore in most other navies.Commodore was historically a wartime rank in the U.S. Navy, as in the case of Commodore Perry. Commodore continues to be an operational role, typically filled by senior Navy captains. In the United States uniformed services, rear admiral (lower half) replaced the rank of commodore in 1985.<gallery>File:US Navy O7 insignia.svg|The star and shoulder boards of a US Navy rear admiral (lower half)File:US CG O7 insignia.svg|The star and shoulder boards of a US Coast Guard rear admiral (lower half)File:USA - PHS - O7 insignia.png|The star and shoulder boards of a US Public Health Service rear admiral (lower half)File:USA - NOAA - O7 insignia.png|The stars, shoulder boards, and sleeve stripes of a National... Read More