U.S. Marine Corps Lance Cpl. Richard Patterson, 1st Tank Battalion, Delta Company, performs safety checks on a .50-caliber machine gun while being evaluated by Cpl. Timothy Grottendick, Tactical Training Exercise Control Group, both located at Marine Corps Air Ground Combat Center Twentynine Palms (MCAGCC), Calif., during Integrated Training Exercise 2-15 at MCAGCC, Feb. 5, 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)