The US Army Bombe was physically very different from the British and US Navy bombes. There were 104 brushes per drum, 720 drums per bombe, and ultimately around 200 bombes. The bakers were required to make 6 snowy bombe Alaska tarts in the signature challenge. The menu included Filet de Sole Mountbatten, Perdreau en Casserole, and Bombe Glacee Princess Elizabeth. Enigma was the electromechanical Bombe, not Colossus. The cryptanalyst hypothesised one plugboard interconnection for the bombe to test. Sergeant Jones was given the overall responsibility for Bombe maintenance by Edward Travis. The US Army also produced a version of a bombe. The first bombe was named "Victory". The last-manufactured US Navy bombe is on display at the US National Cryptologic Museum. On the front of each bombe were 108 places where drums could be mounted. Welchman invented the "Diagonal Board", an addition which made the English Bombe immensely more powerful. The first bombe was installed on 18 March 1940. Recent bombe simulations have shown similar results. A bombe could run two or three jobs simultaneously.