U.S. Air Force Senior Master Sgt. Terrance Smiley, 633rd Air Base Wing career assistance advisor, briefs Airmen about changes to Enlisted Professional Military Education requirements, at Langley Air Force Base, Va., June 24, 2015. The changes, which establish several phases of distance and in-residence learning, affect Airmen in the ranks of senior airman through senior master sergeant. (U.S. Air Force photo by Airman 1st Class Devin S. Michaels/Released)