U.S. Marine Corps Sgt. Nathan Hanson (left) and Sgt.

U.S. Marine Corps Sgt. Nathan Hanson (left) and Sgt. Aldo Gongora both Combat Instructors with Infantry Training Battalion, School of Infantry-East, write out their casualty evacuation order during the Instructor Stakes on Camp Geiger, N.C., Sept. 10, 2015. The Combat Instructor Stakes is a grueling 32-hour competition that pits two man, Combat Instructor teams against each other competing in physical, tactical and knowledge based events while carrying a combat load and moving over 55 kilometers on foot. (U.S. Marine Corps Photo by SOI-E Combat Camera, Staff Sgt. Mark E Morrow Jr/Released)