In May 1953, the Upshot-Knothole tests proved that the M65 Atomic Cannon could fire a 16 kiloton yield nuclear weapon seven miles (11.3 km). It used the same warhead that Oppenheimer had helped create. The United States constructed twenty of these weapons and deployed them to Europe and Korea as deterrents against a communist invasion. None of the atomic cannons were used in combat. The hostile nations showed good sense by not openly attacking each other. This kit features a crew of seven figures and US Army decals.