U.S. Air Force Gen. Janet C. Wolfenbarger, commander of Air Force Materiel Command, speaks to Airmen during a visit to Langley Air Force Base, Va., April 9, 2014. Wolfenbarger, the first female four-star general in the Air Force, spent the day visiting Airmen assigned to the 735th Supply Chain Operations Group. (U.S. Air Force photo by Airman 1st Class Kimberly Nagle/Released)