Tech. Sgt. Ben Mahan, above, and Staff Sgt. Bradley Duncan, 336th Aircraft Maintenance Unit avionics technicians from Seymour Johnson Air Force Base, N.C., perform maintenance on an F-15 Strike Eagle aircraft May 4 at Hill AFB, Utah. More than 40 combat aircraft participated in the U.S. Air Force air-to-ground weapons evaluation known as Combat Hammer including: F-15Es from Seymour Johnson AFB, N.C.; A-10s from Davis-Monthan AFB, N.M.; F-16s from Hill AFB and Tuscon Air National Guard Base, Arizona; B-1s from Dyess AFB, Texas; and B-52s from Minot AFB, N.D. The fighter units deployed to Hill, while bomber units participated from their home stations. (U.S. Air Force photo by Paul Holcomb)