13. The OSS

Take a look at America's Office of Strategic Services, which was modelled on the British Special Operation Executive. William J. Donovan established the famous U.S World War II intelligence and sabotage agency, which was the precursor of the CIA. Much of the OSS work concerned the Allies' landings in North Africa and Europe, the placing of nearly 200 agents in Nazi Germany, assisting French resistance groups, and working in the Far East against the Japanese.