U.S. Air Force Senior Master Sgt. Scott Butler, Air Force Weather Agency, is congratulated by U.S. Air Force Chief Master Sgt. Matthew Grengs, 55th Wing Command Chief, on being one of nine Team Offutt senior master sergeants selected for promotion to chief as announced by Air Force Personnel Center officials Nov. 20. Air Force-wide, 479 senior master sergeants were selected out of 2,525 eligible for an 18.97 percent selection rate, according to AFPC. (U.S. Air Force photo by Jeff W. Gates/Released)