Airman 1st Class Leslie Friestad, 90th Maintenance Operations Squadron, performs maintenance on a missile guidance set during missile maintenance training in the U-01 practice launch facility on F.E. Warren Air Force Base, Aug. 4, 2014. The practice launch facility prepares Airmen for the rigorous maintenance they will have to routinely conduct on actual missiles as part of their duties. (U.S. Air Force file photo by Lan Kim)