U.S. Marine Corps Pfc. Jaycob Schlangen, Chemical Biological Radilogical Nuclear specialist, with Headquarters Battalion Security Platoon, 1st Marine Division (1STMARDIV), cleans M240B machine gun during Exercise Steel Knight 15 (SK-15) aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 11, 2014. SK-15 is an annual training exercise developed to prepare 1STMARDIV personnel to execute military operations as a Ground Combat Element within a Marine Air-Ground Task Force. (U.S. Marine Corps photograph by LCpl. Adrianna R. Lincoln/RELEASED)
Lance Cpl. Adrianna Lincoln
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