U.S. Marines with 1st Battalion, 4th Marines, from Camp Pendleton, Calif., shield their faces during the landing of a Marine MH-53 Helicopter Jan. 25, 2015, during Integrated Training Exercise 2-15 at Twentynine Palms Marine Corps Air Ground Combat Center (MCAGCC), Calif. 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 Master Sgt. Donald R. Allen/Released)