U.S. Marines assigned to 1st Battalion, 4th Marines, Camp Pendleton, Calif., prepare an Assault Amphibious Vehicle for a mechanized assault course event during Integrated Training Exercise 2-15 at Marine Corps Air Ground Combat Center Twentynine Palms (MCAGCC), Calif., Feb. 6, 2015. MCAGCC conducts relevant live-fire combined arms training, urban operations, and Joint/Coalition level integration training that promotes operational forces readiness. (U.S. Air Force photo by Staff Sgt. Heather Cozad Staley/Released)