what is the highest enlisted rank in the marines
United States Marine Corps rank insignia The Sergeant Major of the Marine Corps is a billet and with it carries a special rank insignia, conferred on the senior enlisted Marine of the entire Marine Corps, personally selected by the Commandant of the Marine Corps.[6] It and the Marine Gunner are the only billets which rate modified rank insignia in place of the traditional rank insignia.[citation needed]
Technical sergeant Within air force enlisted ranks, promotion to technical sergeant has historically been the second-most difficult rank to achieve[citation needed] (only the rank of senior master sergeant, capped by federal law, has lower promotion rates[citation needed]) and is the most difficult promotion that most career air force members achieve[citation needed]. A staff sergeant must have served at least 23 months in grade to be considered for promotion to technical sergeant[citation needed]. It normally takes 10â€“12 total years of service to attain this pay grade[citation needed]. Technical sergeants mentor junior enlisted personnel while preparing themselves for promotion to master sergeant, the entry rank of the senior non-commissioned grades.[citation needed]