what is the equivalent of a colonel in the navy
Colonel (United States) In the United States Army, Marine Corps, and Air Force, colonel /ˈkɜːrrnəl/ is the most senior field grade military officer rank, immediately above the rank of lieutenant colonel and immediately below the rank of brigadier general. It is equivalent to the naval rank of captain in the other uniformed services.[n 1] The pay grade for colonel is O-6.
Non-commissioned officer In the Army, Air Force, and Marine Corps, all ranks of sergeant are termed NCOs, as are corporals in the Army and Marine Corps. A Marine Corps lance corporal (E-3) is not an NCO, but rather junior enlisted. The rank of corporal (E-4) in the Army is a junior NCO, and is to be shown the same respect as any other NCO. In the United States Air Force, E-5 (staff sergeant) and E-6 (technical sergeant) are classified under the NCO tier, while E-7 (master sergeant), E-8 (senior master sergeant), and E-9 (chief master sergeant) are considered senior non-commissioned officers (SNCOs).[10] In the Navy and Coast Guard, all ranks of petty officer are so designated. Junior NCOs (E-4 through E-6 grade), or simply "NCOs" (E-4 and E-5 only) in Marine Corps usage, and function as first-tier supervisors and technical leaders.