U.S. Navy Air Traffic Controller 2nd Class Leonard Collins fires an MK-38 25 mm chain gun during a live-fire exercise Sept. 26, 2010, while under way in the Philippine Sea aboard the multi-purpose amphibious assault ship USS Iwo Jima (LHD 7). (DoD photo by Mass Communication Specialist 2nd Class Zane Ecklund, U.S. Navy/Released)