Airman 1st Class Johnnie Chellberg, a fuel systems specialist with the 20th Component Repair Squadron at Shaw Air Force Base, S.C., tests the aerial refueling receptacle of a F-16CJ on Tuesday. The receptacle is on the aircrafts' spine and allows the jet to air refuel to extend its mission length. Chellberg, along with many others, is preparing the base's jets for missions associated with Operational Readiness Exercise Sea Lion 02-01, held at Shaw. —REUTERS