U.S. Marine Corps Corporal Jin G. Choi an Armorer with Headquarters and Service Company, Third Battalion, Third Marine Regiment (3/3), collects water using a platypus purification system near Landing Zone Quail at Mountain Warfare Training Center, Bridgeport, California on Sep. 28, 2012. The water run was the first of many at the start of Mountain Ex. 12.7, a twelve day exercise designed to prepare the Marines of 3/3 both physically and mentally for high elevation environments.