15. Fourth Air Force, Hamilton Field, CA investigated the 8 July 1947 UFO sightings at Muroc Army Air Field (later, Edwards AFB, and Air Force Flight Test Center), California. The witness affidavits are available online from: http://www.project1947.com/fig/muroc47.htm. A few month’s later, on 14 October 1947, Air Force Capt. Chuck Yeager flew the Bell X-1 on the first manned supersonic flight at Muroc AAF.