At the meeting of the Lothians Radio Society on 24th April 2013 an American-made video of the work of Code Breakers was shown. It described how code breakers shaped major events in the 20th century, including America’s entry into WWI through the decoding of the Zimmermann telegram, the cracking of the German Enigma code at GC&CS Bletchley Park during WWII, victory at the Battle of Midway and Japan’s Purple Cipher.