The U.S. Navy's Cryptanalytic Bombe is the culmination of years of work and the efforts of mathematicians and engineers from Poland, England, and the United States. It was the solution to the problem of Germany's World War II 4-rotor cipher machine Enigma, and it led to the Allies' successes in the battle of the Atlantic and the war in Europe. In 1942 a fourth rotor was added to the U-boat Enigmas and the original British Bombes, designed to solve the three-rotor Enigmas, were not able to find solutions to those messages. WAVES (Women Accepted for Volunteer Emergency Service) were inducted into the U.S. Navy and built and operated the Bombes, working 24 hours a day, 7 days a week. They set the machines up and tested the results. The U.S. Navy Bombes rapidly searched the hundreds of thousands of possible settings on one wheel order of a four-rotor Enigma. (The German Navy had eight wired rotors from which to select three that went into the Enigmas. The fourth rotor remained in its position.) The Navy Bombes, and those who built and operated them, played a crucial role in saving Allied and Axis lives and hastened the end of the war in the Atlantic and Europe.