U.S. Air Force Master Sgt. Don Allen, combat aerial

U.S. Air Force Master Sgt. Don Allen, combat aerial photojournalist, 4th Combat Camera Squadron, March Air Reserve Base, Calif., documents Marines with 1st Battalion, 4th Marines, from Camp Pendleton, Calif., participating in a mobile assault course event during Integrated Training Exercise 2-15 at Marine Corps Air Ground Combat Center Twentynine Palms (MCAGCC), Calif., Feb. 4, 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 Master Sgt. John R. Nimmo, Sr./Released)