U.S. Marines and Navy Sailors from the School of

U.S. Marines and Navy Sailors from the School of Infantry-East and Weapons and Training Battalion pack their gear before beginning the Combat Instructor Stakes Competition on Camp Geiger, N.C., March 16, 2015. The School of Infantry-East hosted the Combat Instructor Stakes, which is a grueling 30-hour competition that pits two man teams against each other, competing in physical, tactical and knowledge based events while carrying a combat load and moving over 50 kilometers on foot. (U.S. Marine Corps photo by SOI-East Combat Camera, Cpl. Andrew Kuppers/ Released)