Announced United States Nuclear Tests -- By Date Event Name... - Date (GCT) | Location. .... . Type ae Purpose - °::: Operation Fiintiock -- Continued Double Play DoD Event Accidental release of radioactivity detected off site 06/15/66 NTS Tunnel WeaponsEffects Less than 20 kt Kankakee 06/15/66 NTS Shaft WeaponsRelated 20 to 200 kt Vulcan Device development Heavy element production 06/25/66 NTS Shaft Piowshare 25 kt Halfbeak 06/30/66 NTS Shaft WeaponsRelated 365 kt Operation Latchkey | oe Saxon 07/28/66 NTS Shaft Plowshare Less than 20 kt Rovena 08/10/66 NTS Shaft Weapons Related Less than 20 kt Derringer Accidental release of radioactivity 09/12/66 NTS Shaft Weapons Effects Less than 20 kt Daiquiri 09/23/66 NTS Shaft WeaponsRelated Less than 20 kt Newark 09/29/66 NTS Shaft Weapons Related Less than 20 kt Simms Excavation device development 11/05/66 NTS Shaft Plowshare Less than 20 kt Ajax Accidental release of radioactivity 11/11/66 NTS Shaft Weapons Related Less than 20 kt Cerise Accidental release of radioactivity detected on site only 11/18/66 NTS Shaft WeaponsRelated Less than 20 kt Sterling Nuclear test detection experiment 12/03/66 Hattiesburg Shaft Vela Uniform 380 tons Excavation device development detectedoff site detected on site only -3]-