maxresdefault Published on February 12, 2018 in 13 February 1950Full resolution (1280 × 720) ← Previous Next → Operation Ranger, Shot Able, 5:45 a.m., 27 January 1951. Mark 4 bomb, 1,060 foot ( meters) air burst. Yield, 1 kiloton. This was the first nuclear test in the continental United States since Trinity, 16 July 1945.