LANGLEY AIR FORCE BASE, Va. -- Airman 1st Class Hector Barreto mans a bunker, armed with an M-249 squad assault weapon during a phase 1 and 2 operation readiness exercise here April 13. Airman Barreto is a security forces Airmen with the 1st Security Forces Squadron. (U.S. Air Force photo by Staff Sgt. Verlin Levi Collins)