U.S Marines with Company G, 1st Battalion, 6th Marine Regiment, 2nd Marine Division, patrol during Mountain Training Exercise 2-19, at Marine Corps Mountain Warfare Training Center, Bridgeport, Calif., March 24, 2019. The purpose of MTX is to prepare Marines for harsh weather conditions while enhancing winter warfare skills in cold weather environments. - U.S Marines with Company G, 1st Battalion, 6th Marine Regiment, 2nd Marine Division, patrol during Mountain Training Exercise 2-19, at Marine Corps Mountain Warfare Training Center, Bridgeport, Calif., March 24, 2019. The purpose of MTX is to prepare Marines for harsh weather conditions while enhancing winter warfare skills in cold weather environments.