YOKOTA AIR BASE, Japan -- Col. Stephen Oliver Jr., 515th Air Mobility Operations Wing commander, passes the guidon to Col. Robert Ricci, 515th Air Mobility Operations Group commander, during the 515th AMOG change of command July 13. Colonel Ricci replaced Col. Mark Baker as commander of the 515th AMOG. (U.S. Air Force photo/Katrina R. Menchaca)