At 5:29 A.M. on July 16th, 1945, the United States Army conducted the first detonation of a nuclear weapon on the Trinity Site in the New Mexico desert. The bomb, nicknamed the "gadget", was an implosion-design plutonium bomb, which was the same design as the Fat Man bomb that would later flatten Nagasaki, Japan in August 1945. Due to concerns of whether the Fat Man bomb would work led to the first nuclear test. The code name "Trinity" was assigned by Manhattan Project leader, J. Robert Oppenheimer. Thousands of people lived somewhat close to the test site, but no one was evacuated before or after the test. In the early 1950s, nuclear bomb tests became a tourist attraction in the Las Vegas desert. In 1965, the test site was declared a National Historic Landmark.
