Marine Corps Gunnery Sgt. Aubrey Wrenn (right), Chief Instructor Trainer, Marine Combat Instructor School, School of Infantry-East, briefs Marines on night land navigation portion of Combat Instructor Stakes on Camp Geiger, , 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. ( Marine Corps Photo by SOI-E Combat Camera, Staff Sgt. Mark E Morrow Jr/Released)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: combat, corps, infantry-east, instructor, marine, mcis, schoo, school, soi-, stakes