U.S. Army soldier, Spc. Xavier Rivera at Alpa company 1st Battalion 65th Infantry, secures the perimeter at the pick-up point for the C-130 Hercules during a mass casualty exercise, Dec. 17, in Grand Bara, Djibouti. This mass casualty exercise simulates a C-130 crash and recovery. Four evaluators, seven Army and four PJs from the 82nd Expeditionary Rescue Squadron at Combined Joint Task Force - Horn of Africa, participated in the exercise.