160202-N-WQ574-003 OAK HARBOR, Wash. (Feb. 2, 2016) Master-at-Arms 2nd Class Scott Johnson apprehends a suspect during an active shooter drill at Naval Air Station Whidbey Island as part of exercise Solid Curtain-Citadel Shield. This annual exercise assesses the command readiness to respond to potential threats on or near naval installations. (U.S. Navy photo by Mass Communication Specialist 3rd Caleb Cooper/Released)