U.S. flag at half-mast in front of the U.S. Air Force Tactical Fighter Weapons Center at Nellis Air Force Base (Nevada) following a fatal Thunderbirds crash in Indian Springs, Nevada.
The swept-wing F-111 is flown by the U.S. Air Force's 474th Tactical Fighter Wing. The 474th was the first operation unit in the Air Force to be equipped with the F-111. This photograph was probably taken over Nellis Air Force Base (Nevada).
Black and white image showing the beginning of a 5000-hole dynamite blast in Black Canyon at the site of Hoover Dam construction. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image showing a river-level view of canyon blasting in Black Canyon at the site of Hoover Dam construction. Note: Boulder Dam was officially renamed Hoover Dam in 1947.