Nuclear chain reaction the last one called ""Perfectionnement aux charges explosives"" was the first patent for the atomic bomb and is filed as patent n°445686 by the Caisse nationale de Recherche Scientifique. In parallel, Szilárd and Enrico Fermi in New York made the same analysis. This discovery prompted the letter from Szilárd and signed by Albert Einstein to President Franklin D. Roosevelt, warning of the possibility that Nazi Germany might be attempting to build an atomic bomb. On December 2, 1942, a team led by Enrico Fermi produced the first artificial self-sustaining nuclear chain reaction with the Chicago Pile-1 (CP-1) experimental reactor in
Nuclear Reactor Operator Badge Nuclear Reactor Operator Badge The Nuclear Reactor Operator Badge is a decoration of the United States Army which was issued between the years of 1965 and 1990. In 1991, the decoration was declared obsolete by Army Regulation 600-8-22, but uniform regulations permit the continued wearing of badges awarded before then. The Nuclear Reactor Operator Badge is worn above the ribbons over the left pocket flap of the Army uniform, in the same position as the Parachutist Badge. The Nuclear Reactor Operator Badge was first authorized on June 18, 1965. The badge was issued in four degrees; the basic badge was