In the United States, commander is a military rank (O-5) that is also sometimes used as a military billet title—the designation of someone who manages living quarters or a base—depending on the branch of service. It is also used as a rank or title in non-military organizations, particularly in law enforcement.
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👉 Commander (United States) in the context of Captain (United States O-6)
In the United States Navy, United States Coast Guard, United States Public Health Service Commissioned Corps (USPHS Corps), and National Oceanic and Atmospheric Administration Commissioned Officer Corps (NOAA Corps), captain is the senior-most commissioned officer rank below that of flag officer (i.e., admirals). The equivalent rank is colonel in the United States Army, Air Force, Space Force, and Marine Corps.
Reflecting its nautical heritage, the term captain is used as a military title by officers of more junior rank who command a commissioned vessel of the Navy, Coast Guard, or National Oceanic and Atmospheric Administration (NOAA) of patrol boat size or greater. Officers below O-6 who command aviation squadrons (typically O-5 commanders) usually use the less formal title "skipper".
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Commander (United States) in the context of Lieutenant colonel (United States)
In the United States Army, Marine Corps, Air Force and Space Force, lieutenant colonel is a field grade officer rank, just above the rank of major and just below the rank of colonel. It is equivalent to the naval rank of commander in the other uniformed services.
The pay grade for the rank of lieutenant colonel is O-5. In the United States armed forces, the insignia for the rank is a silver oak leaf, with slight stylized differences between the version of the Army and the Air Force and that of the Navy and the Marine Corps. Oak leaves and acorns were used in the early American army on high ranking officer's headwear and may have come from the British or Germans as oak leafs and acorns were used in German uniforms in the 18th Century. The Army and US Air Force oak leaf is a stylized silver leaf that does not represent any individual tree. The Marine Corps version is styled like a navy Commander's and is similar to a southern live oak leaf grown in the Naval Live Oaks Reservation in the 19th Century.