Marines trek up a mountain during a five- mile conditioning hike as part of the Mountain Warfare Training exercise in Bridgeport, Calif., Aug. 22, 2017. Mountain Warfare Training is a field exercise designed to teach Marines fighting tactics and survival skills in high altitudes and cold weather. The Marines are with 2nd Law Enforcement Battalion, 3rd Law Enforcement Battalion, 2nd Intelligence Battalion, 6th Communication Battalion, 2nd Low Altitude Air Defense Battalion, and 2nd Assault Amphibian Battalion. (U.S. Marine Corps Photo by Lance Cpl. Gloria Lepko.)

Courtesy of DVIDS