U.S. Air Force Staff Sgt. John Milhoan, 161 Air Refueling Wing communications and navigation specialist, changes out an enhanced GPS inertial navigation unit on a KC-135 Stratotanker. Milhoan was part of a maintenance repair team sent to Wyoming in March to help out fellow Airmen from Eielson Air Force Base, Alaska. (U. S. Air National Guard photo by Master Sgt. Kelly M. Deitloff)