United States Air Force Brig. Gen. Chuck Yeager, retired, adjusts his harness at the 65th Aggressor Squadron before his flight Oct. 14, 2012, at Nellis Air Force Base, Nev. When Yeager broke the sound barrier in 1947, he was flying the Bell XS-1 rocket research plane named the "Glamorous Glennis" over Edwards Air Force Base, Calif.