Reserve Marines with Company F, 4th Tank Battalion, 4th Marine Division, disassemble heating units from their arctic tents on training day five of exercise Winter Break 2018, aboard Camp Grayling, Michigan, Feb. 11, 2018. Fox Co., 4th Tank Bn., conducted exercise Winter Break 18 to take advantage of Camp Grayling's frozen, wintery climate and test their offensive, defensive and maneuver capabilities in any austere cold weather environment.