Yeager broke the sound barrier on October 14, 1947, in level flight while piloting the X-1 "Glamorous Glennis" at Mach 1.05 at an altitude of over the Rogers Dry Lake of the Mojave Desert in California. The success of the mission was not announced to the public until June 1948. Yeager was awarded the Mackay Trophy and the Collier Trophy in 1948 for his mach-transcending flight, and the Harmon International Trophy in 1954. The X-1 he flew that day was later put on permanent display at the Smithsonian Institution's National Air and Space Museum.