The Comprehensive Test Ban Treaty Nuclear weapons have been a major concern of National Security agencies since the end of World War 2. The first nuclear bomb in the history of the world was exploded on July 18, 1945 at Alamogordo air base in New Mexico. Although the first nuclear bomb was just a test, the second and third were far from that. On August 6, 1945 the U.S. warplane "Enola Gay" dropped a nuclear bomb on the army base at Hiroshima Japan. This bomb, the first exploded in warfare, and the bomb dropped on Nagasaki four days later killed an estimated 70,000 Japanese soldiers and civi