Nearly everyone whos seen it and lived to tell the tale describes it the same way: a horrifying, otherworldly thing of ghastly beauty that has haunted their life ever since. The colors were beautiful, remembers a man in Morgan Knibbes short documentary The Atomic Soldiers. I hate to say that. Many tales of the atomic bomb, however, werent told at all. In addition to the hundreds of thousands of Japanese civilians who died in Hiroshima and Nagasaki, an estimated 400,000 American soldiers and sailors also observed nuclear explosions - many just a mile or two from ground zero. From 1946 to 1992, the U.S. government conducted more than 1,000 nuclear tests, during which unwitting troops were exposed to vast amounts of ionizing radiation. After the tests, the soldiers, many of whom were traumatized, were sworn to an oath of secrecy. Breaking it even to talk among themselves was considered treason, punishable by a $10,000 fine and 10 or more years in prison. In Knibbes film, some of these atomic veterans break the forced silence to tell their story for the very first time. They describe how the blast knocked them to the ground; how they could see the bones and blood vessels in their hands, like viewing an X-ray. What appalled Knibbe the most was how the U.S. government failed the veterans. Until this day, a lot of what has happened - and the radiation-related diseases the veterans have contracted and passed on to the generations after them - is still being covered up, Knibbe said.