Master-at-Arms Seaman Michael Angelo and Officer Joshua Makin, from the Virginia Beach Police Department, cover a doorway during an active shooter drill at Naval Air Station Oceana as part of Exercise Solid Curtain-Citadel Shield 2015 (SC-CS15). SC-CS15 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)