Announced United States Nuclear Tests -- By Event '- Event Name. Date (GCT) Location © annaer eeennaee Type. . Purpose enon Yield Range = Chess 06/20/79 NTS Shaft WeaponsRelated Less than 20 kt Chetco 05/1 9/62 Christmas tsland Airdrop Weapons Related Intermediate Chevre 11/23/76 NTS Shaft Weapons Related Less than 20 kt Chiberta 12/20/75 NTS Shaft WeaponsRelated 20 to 200 kt Chinchilla 02/19/62 NTS Shaft WeaponsRelated 1.9 kt Chinchilla 1! 03/31/62 NTS Shaft WeaponsRelated Low Chipmunk 02/15/63 NTS Shaft Weapons Related Low Chocolate 04/21/67 NTS Shaft Weapons Related Less than 20 kt Cimarron 02/23/62 NTS Shaft WeaponsRelated 11.90 kt Clairette 02/05/81 NTS Shaft WeaponsRelated Less than 20 kt Clarksmobile 05/17/68 NTS Shaft Weapons Related 20 to 200 kt Clean Slate| Operation Roller Coaster 05/25/63 Bombing Range Surface Storage-Transp. Zero Clean Slate il Operation Roller Coaster 05/31/63 Bombing Range Surface Storage-Transp. Zero Clean Slate II Operation Roller Coaster Pu dispersal 06/09/63 Bombing Range Surface Storage-Transp. Zero Clearwater 10/16/63 NTS Shaft WeaponsRelated Intermediate Climax 06/04/53 NTS Airdrop WeaponsRelated 61 kt Operation Dominic Accidental release of radioactivity area detected on site only Accidental release of radioactivity detected on site only Pu dispersal Radioactivity detected off site Pu dispersal Radioactivity not detected off site Radioactivity detected off site -65-