Secretary of the Air Force Michael Donley speaks to the audience during the chief of staff transition ceremony honoring Gen. Norton Schwartz and Gen. Mark A. Welsh III at Joint Base Andrews, Md., Aug. 10, 2012. Schwartz served in the Air Force for 39 years, the last four years as the Air Force's senior uniformed leader. Prior to becoming the Air Force chief of staff, Welsh commanded U.S. Air Forces in Europe. (U.S. Air Force photo/Scott M. Ash)