what is the highest enlisted rank in the marine corps
Sergeant Major of the Marine Corps In the U.S. Marine Corps, sergeant major is the ninth and highest enlisted rank, just above first sergeant, and equal in grade to master gunnery sergeant, although the two have different responsibilities. A sergeant major typically serves as the unit commander's senior enlisted adviser and to handle matters of discipline and morale among the enlisted Marines. The Sergeant Major of the Marine Corps is chosen by the Commandant of the Marine Corps to serve as his adviser and is the preeminent and highest ranking enlisted Marine with an order of precedence of a lieutenant general.[3]
Captain (United States O-6) 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 (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, and Marine Corps. The predecessors of the NOAA Corps—the United States Coast and Geodetic Survey Corps (1917–1965) and the Environmental Science Services Administration Corps (ESSA Corps) (1965–1970)—also used the rank.