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.
Commandant of the Marine Corps The Commandant of the Marine Corps (CMC) is normally the highest-ranking officer in the United States Marine Corps and is a member of the Joint Chiefs of Staff.[1] The CMC reports directly to the United States Secretary of the Navy and is responsible for ensuring the organization, policy, plans, and programs for the Marine Corps as well as advising the President, the Secretary of Defense, the National Security Council,[1] the Homeland Security Council,[1] and the Secretary of the Navy on matters involving the Marine Corps. Under the authority of the Secretary of the Navy, the CMC designates Marine personnel and resources to the commanders of Unified Combatant Commands.[2] The Commandant performs all other functions prescribed in Section 5043 in Title 10 of the United States Code[3] or delegates those duties and responsibilities to other officers in his administration in his name. As with the other joint chiefs, the Commandant is an administrative position and has no operational command authority over United States Marine Corps forces.