U.S. Marine Corps Maj. Nicholas B. Perkins, center,

U.S. Marine Corps Maj. Nicholas B. Perkins, center, operations officer, with 2nd Battalion, 6th Marine Regiment (2/6), conducts a rehearsal of concept brief during a Winter Training Exercise at Marine Corps Mountain Warfare Training Center (MCMWTC), Bridgeport, Calif., Jan. 17, 2015. The Marines of 2/6 participated in the exercise at MCMWTC to prepare them for the challenges of operating in cold and mountainous environments. (U.S. Marine Corps photo by Cpl. Jalen D. Phillips, 2nd Marine Division Combat Camera/Released)