Commandant of the Marine Corps Gen. James Amos and Sgt. Maj. of the Marine Corps Micheal Barrett pose with Sgt. Iasia Brown at The Clubs of Quantico on Feb. 3, 2014. Brown was meritoriously promoted to staff sergeant due to her outstanding performance in 2013. - Commandant of the Marine Corps Gen. James Amos and Sgt. Maj. of the Marine Corps Micheal Barrett pose with Sgt. Iasia Brown at The Clubs of Quantico on Feb. 3, 2014. Brown was meritoriously promoted to staff sergeant due to her outstanding performance in 2013.