Marine Corps Martial Arts instructor trainer Sgt. Daniel J. Leith looks on as Sgt. Joshua M. Carter, a satellite communications instructor at Fort Gordon, Ga., and Sgt. Andre D. Charles, adjunant noncommissioned officer in charge at Marine Aviation Training Support Group 21 in Pennsacola, Fla., gang up on Staff Sgt. Matthew T. Lightfoot, an instructor at advanced infantry training battalion west at Camp Pendleton, Calif., during the shallow-water grappling portion of the MCMAP instructor trainer course at Marine Corps Base Quantico, Va., Sept. 13. The students grappled following a rigorous trainng routine to build up their mental and physical endurance.