Airman 1st Class Daniel Sorters, 28th Aircraft Maintenance Squadron load crew member, takes cover with other Airmen during Alarm Red on the flightline during the Phase II portion of an operational readiness exercise at Ellsworth Air Force Base, S.D., July 11, 2013. Alarm Red signifies to the base that an attack is imminent or in progress and that all Airmen should seek cover immediately. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)