Announced United States Nuclear Tests-- By Event Event Name. - = Date (GCT) Location Type - ‘Purpose... Yield Range. Islay 08/27/81 NTS Shaft WeaponsRelated item First test of the boosting principle 05/24/51 Enewetak Tower WeaponsRelated Jal 03/19/70 NTS Shaft WeaponsRelated Less than 20 kt Jefferson 04/22/86 NTS Shaft WeaponsRelated 20 to 150 kt Jerboa 03/01/63 NTS Shatt WeaponsRelated Low John 07/19/57 NTS Rocket WeaponsEffects About 2 kt Johnnie Boy 07/11/62 NTS Crater WeaponsEffects 0.5 kt Jornada 01/28/82 NTS Shaft WeaponsRelated 20 to 150 kt Jorum 09/16/69 NTS Shaft Weapons Related Less than 1 MT Junction Treaty verification event 03/26/92 NTS Shaft WeaponsRelated 20 to 150 kt 07/22/58 Bikini Barge Weapons Related Air-to-air missile Slightly below ground DoD Event--Operation Sunbeam Less than 20 kt Release of radioactivity detected off site Juno 10/24/58 NTS Surface Safety Experiment 1.7 tons Kankakee 06/15/66 NTS Shaft Weapons Related 20 to 200 kt Kappeli 07/25/84 NTS Shaft Weapons Related 20 to 150 kt Kash 06/12/80 NTS Shaft WeaponsRelated 20 to 150 kt Kasseri 10/28/75 NTS Shaft Weapons Related 200 to 1000 kt Kaweah 02/21/63 NTS Shaft Plowshare Low Kawich 02/24/89 NTS Shaft WeaponsRelated Less than 20 kt Kearsarge 08/17/88 NTS Shaft Weapons Related Less than 150 kt Fired in surface structure Radioactivity not detected off site Device development -79- eabiound Juniper