U.S. Marines assigned to Marine Attack Squadron (VMA) 214, Marine Corps Air Staion Yuma, Ariz., perform pre-launch checks for an AV-8B Harrier aircraft in support of Integrated Training Exercise 2-15 at Marine Corps Air Ground Combat Center Twentynine Palms (MCAGCC), Calif., Feb. 7, 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. Amy F. Picard/Released)