150203-N-IS680-077 VIRGINIA BEACH, Va. (Feb. 3, 2015) Master-at-Arms 2nd Class Cody Ruvolo, Master-at-Arms 3rd Class James Dylon Allen, Master-at-Arms Seaman Michael Angelo and Master-at-Arms 3rd Class Wilkyns Nova respond to an active shooter during a drill at Naval Air Station Oceana as part of Exercise Solid Curtain-Citadel Shield 2015. Solid Curtain-Citadel Shield is the Navy�s largest annual force protection exercise designed to test the service�s security forces to respond to threats to installations and units. (U.S. Navy photo by Mass Communication Specialist 2nd Class Alysia R. Hernandez/Released)