<P> The collaboration between the British and the Americans led to the 1958 US - UK Mutual Defence Agreement between the two nations, whereby American nuclear weapons technology was adapted for British use . </P> <P> Electronics rose to prominence quickly in World War II . The British developed and progressed electronic computers which were primarily used for breaking the "Enigma" codes, which were Nazi secret codes . These codes for radio messages were indecipherable to the Allies . However, the meticulous work of code breakers based at Britain's Bletchley Park cracked the secrets of German wartime communication, and played a crucial role in the final defeat of Germany . Americans also used electronic computers for equations, such as battlefield equations, ballistics, and more . Numerous small digital computers were also used . From calculating tables, to mechanical trajectory calculators, to some of the most advanced electronic computers . Soldiers would usually carry most of the electronic devices in their pockets, but since technology has developed, digital computers started to increase in size, which spacious command and control centres would have . Initial control centers that were embarked on ships and aircraft that established the networked computing, is so essential to our daily lives . While prior to the war few electronic devices were seen as important pieces of equipment, by the middle of the war instruments such as radar and ASDIC (sonar) had become invaluable . Germany started the war ahead in some aspects of radar, but lost ground to work in England and to physicists and engineers at the "Radiation Laboratory" of the Massachusetts Institute of Technology . Half of the German theoretical physicists were Jewish and had emigrated or otherwise been lost to Germany long before WW II started . </P> <P> Equipment designed for communications and the interception of those communications became critical . The Germans widely relied on the Enigma coding machine for encrypting communications . The British developed a new method for decoding Enigma benefiting from information given to Britain by the Polish Cipher Bureau, which had been decoding early versions of Enigma before the war . </P> <P> Rocketry was used greatly in World War II . There were many different inventions and advances in rocketry, such as: </P>

What was the main form of communication during ww2