ANDREWS AIR FORCE BASE, Md. -- Maj. Gen. Robert E. Duignan, 4th Air Force commander, presents the 459th Air Refueling Wing guidon to Col. Tim Cahoon at the change of command ceremony here July 13. Current 459th Air Refueling Wing Commander Col. Stayce D. Harris relinquished the guidon and Col. Tim Cahoon, current 459th ARW vice commander, officially assumes command Aug. 1. (Center) Chief Master Sgt. Patti Hickman, 459th ARW command chief, looks on. (U.S. Air Force photo/Tech. Sgt. Eric Sharman)