Airmen from the 39th Security Forces Squadron, prepare to tactically enter a protective aircraft shelter March 18, 2015, at Incirlik Air Base, Turkey. The Airmen responded to a simulated attack from inside the shelter as part of an exercise to complete one of their annual training requirements. Security forces members proactively train to ensure wartime readiness. (U.S Air Force photo by Senior Airman Krystal Ardrey/Released)