U.S. Air Force civilians from the 567th Aerospace Maintenance and Regeneration Squadron perform maintenance in the process of regenerating the first QF-16 at the 309th Aerospace Maintenance and Regeneration Group at Davis-Monthan Air Force Base, Ariz., July 9, 2013. The F-16s destined for the drone program have been in storage from three to 12 years. They will complete all time compliance technical orders required for test flights during maintenance activities. (U.S. Air Force photo by Senior Airman Christine Griffiths/Released)