In 1948, the U.S. nuclear stockpile consisted of approximately 50 atomic bombs. Since the industrial complex to produce more nuclear weapons was not fully complete and there were limited amounts of plutonium, researchers wanted to develop more efficient implosion bombs. Operation Sandstone was a series of atmospheric nuclear "proof tests" conducted in the Pacific Proving Grounds Marshall Islands area April and May 1948. The goal of this test series was to prove the workability of changes to impl...