Keywords: Plumbbob Smoky.jpg U S nuclear test Smoky from Operation Plumbbob 31 August 1957 Troop operations near ground zero shortly after detonation resulted in overexposure and elevated leukemia levels 1070 XX-70 1957-08-31 Photo courtesy of National Nuclear Security Administration / Nevada Site Office PD-USGov August 1957 in the United States Plumbbob Smoky Photographs taken on 1957-08-31 |