On June 18, 1964, the first RB/WB-57F was delivered. In 1955, the Martin Aircraft Co. developed a high-altitude version of the B-57 attack bomber. RB-57Ds were used for high-altitude and electronic reconnaissance until being grounded in 1963. An advanced high-altitude version, the RB-57F, was then developed. General Dynamics modified 21 B-57Fs from 1964-66. In the 58th Weather Reconnaissance Squadron at Kirtland AFB, the WB-57Fs collected air samples on nuclear weapons tests. (U.S. Air Force photo)