U.S. Marines with Heavy Helicopter Squadron 366 engage targets during a day and night quick reaction force range aboard Camp Bastion, Helmand province, Afghanistan, on Aug. 19, 2014. The purpose of the training was to familiarize the Marines with their equipment and prepare them to react to any possible contingency at the defense of the Bastion airfield. (Official U. S. Marine Corps photo by Sgt. Dustin D. March/Released)