Cryptography was used extensively during World War II because of the importance of radio communication and the ease of radio interception. The nations involved fielded a plethora of code and cipher systems, many of the latter using rotor machines.As a result, the theoretical and practical aspects of cryptanalysis, or codebreaking, were much advanced. ...

Lists of World War II military equipment are lists of military equipment in use during World War II (1939–1945). They include lists of aircraft, ships, vehicles, weapons, personal equipment and uniforms, and other equipment. There are aggregated military equipment lists by country, and lists of classes of equipment broken down by country or ...