TINKER AIR FORCE BASE, Okla. -- Tinker machinist Debbie Medina shows Gen. Donald Hoffman, commander of Air Force Materiel Command, a nick she discovered in an F100 third-stage disk during a visual inspection. The AFMC commander went to Tinker Air Force Base, Okla., Sept. 9 and 10, 2010, to visit shops across the base. Ms. Medina is with the 76th Propulsion Maintenance Squadron. (U.S. Air Force photo/Margo Wright)