U.S. Air Force Major Stephanie Kennedy, 307th Force Support Squadron operations officer, reads the retirement certificate with Senior Master Sgt. David Roberts, 307th FSS Education and Training superintendent, during his retirement ceremony Dec. 6, 2014, at Barksdale Air Force Base, La. Roberts is retiring after 39 years of military service. (U.S. Air Force photo by Master Sgt. Mary Hinson/Released)