Tech. Sgt. Alan Greene, a 70th Air Refueling Squadron boom operator, lowers the boom to an F-16 Fighting Falcon during an aerial refueling mission out of Luke Air Force Base, Ariz., Nov. 16, 2016. F-16 pilots train on refueling operations to be prepared for longer mission requirements. (U.S. Air Force photo/Senior Airman James Hensley)