Announced United States Nuclear Tests - By Date Event Name..: . . 9: Date (GCT): ve Location.| . Type | =." Purpose |. Yield Range. Project 57 Project 57 No. 4 Pu dispersal 04/24/57 Bombing Range Surface Safety Experiment Zero Operation Plumbbob Boltzmann 05/28/57 NTS Tower WeaponsRelated 12 kt Franklin 06/02/57 NTS Tower Weapons Related 140 tons Lassen 06/05/57 NTS Balloon WeaponsRelated 0.5 tons Wilson 06/18/57 NTS Balloon WeaponsRelated 10 kt Priscilla 06/24/57 NTS Balloon WeaponsReiated 37 kt Coulomb-A 07/01/57 NTS Surface Safety Experiment Zero Hood 07/05/57 NTS Baltoon Weapons Related 74 kt Diablo 07/15/57 NTS Tower WeaponsRelated 17 kt John Air-to-air missile 07/19/57 NTS Rocket WeaponsEffects About2 kt Kepler 07/24/57 NTS Tower WeaponsRelated 10 kt Owens 07/25/57 NTS Balloon WeaponsRelated 9.7 kt Pascal-A Unstemmed hole 07/26/57 NTS Shaft Safety Experiment Slight Stokes 08/07/57 NTS Balloon Weapons Related 19 kt Saturn 08/10/57 NTS Tunnel Safety Experiment Zero Shasta 08/18/57 NTS Tower Weapons Related 17 kt Doppler 08/23/57 NTS Balloon WeaponsRelated 11 ke Radioactivity not detected off site Radioactivity not detected off site No radioactive release detected