Keywords: Plumbbob John Nuclear Test.jpg Photo of the Plumbbob John nuclear warhead test over the Yucca Flats Nuclear Test Site Nevada USA at 14 00 hrs on 19 July 1957 This test was a combination proof test of the AIR-2A Genie unguided air-to-air rocket and an effects test of the W-25 warhead The AIR-2A was fired from a Northrop F-89J Scorpion fighter The rocket travelled 4240 meters in 4 5 seconds at an altitude of 6 000 m 18 500 ft before detonating the 1 7 kt warhead nuclearweaponarchive org http //nuclearweaponarchive org/Usa/Tests/Plumbob html 1957-07-19 USAF PD-USGov Mushroom clouds Plumbbob John |