Secret service World War, 1939-1945 39 History 35 Spies 13 Underground movements 9 Espionage, British 7 Intelligence service 6 更多 ... War 6 Cryptography 5 Espionage 5 Foreign relations 5 Military intelligence 5 World War, 1914-1918 5 Campaigns 4 Aerial operations, American 3 Aerial operations, British 3 Air pilots, Military 3 Electronic intelligence 3 Escapes 3 Flight crews 3 International relations 3 Zionists 3 American 2 British 2 Cold War 2 Diplomatic history 2 Electronic surveillance 2 Espionage, German 2 Guerre mondiale, 1939-1945 2 Heroes 2 少 ...