Announced United States Nuclear Tests -- By Event Event Name . Date (GCT) Location Type Purposa. |. Yield Range ae Antler Accidental release of radioactivity 09/15/61 NTS Tunnel WeaponsRelated 2.6 kt Apache 07/08/56 Enewetak Barge WeaponsRelated Apple-1 03/29/55 NTS Tower WeaponsRelated 14 kt Apple-2 05/05/55 NTS Tower WeaponsRelated 29 kt Apshapa 06/06/63 NTS Shaft WeaponsRelated Low Arabis 03/06/70 NTS Shaft WeaponsRelated Less than 20 kt Argus| 08/27/58 South Atlantic Rocket Weapons Effects 1-2 kt ArgusIl About 300 miles altitude, South 49.5 degrees, West 8.2 degrees 08/30/58 South Atlantic Rocket Weapons Effects 1-2 kt ArgusIll About 300 miles altitude, South 48.5 degrees, West 9.7 degrees 09/06/58 South Atlantic Rocket WeaponsEffects 1-2 kt Arikaree 05/10/62 NTS Shaft WeaponsRelated Low Arkansas 05/02/62 Christmas Island Airdrop WeaponsRelated Low Megaton detected off site Accidental release of radioactivity detected onsite only About 300 miles altitude, South 38.5 degrees, West 11.5 degrees Operation Dominic area Armada 04/22/83 NTS Shaft Joint US-UK Less than 20 kt Armadillo Accidental release of radioactivity detected onsite only 02/09/62 NTS Shaft WeaponsRelated 7.1 kt Arnica 06/26/70 NTS Shaft WeaponsRelated 20 to 200 kt Artesia 12/16/70 NTS Shaft WeaponsRelated 20 to 200 kt Asiago 12/21/76 NTS Shaft WeaponsRelated Less than 20 kt -58-