Cryptanalysis of the Enigma bombes were, however, very fast and the most successful. They were extensively used by Bletchley Park over teleprinter links (using the Combined Cipher Machine) to OP-20-G for both 3-rotor and 4-rotor jobs. Although the German army, SS, police, and railway all used Enigma with similar procedures, it was the "Luftwaffe" (Air Force) that was the first and most fruitful source of Ultra intelligence during the war. The messages were decrypted in Hut 6 at Bletchley Park and turned into intelligence reports in Hut 3. The network code-named ‘Red’ at Bletchley Park was broken regularly and quickly from 22 May 1940
United States Coast Guard Unit 387 Cryptanalysis Unit the neutrality laws. Throughout WWII, the unit used HFDF technology to intercept approximately 10,000 enemy communications from 65 German clandestine networks and played a key role in cracking the “Enigma G” Code of the Green Enigma, the Red Enigma, the Berlin-Madrid Machine, and the Hamburg-Bordeaux Stecker codes. Their HFDF stations expanded to cover the United States with 20 primary stations, nine secondary stations, six contributory stations, and five Coast Guard radio stations. The USCG also had Cutters, trucks, briefcases, and handbags with HFDF technology inside to track “wildcat” stations across the US. The FBI Director J. Edgar Hoover believed that