The Second World War era Office of Strategic Services (OSS) was the forerunner of today's CIA.

During the war the organisation planned and executed thousands of covert operations behind enemy lines from North Africa to Europe to Asia.

This publication reproduces the OSS' 1944 Secret Intelligence Field Manual. It describes the secret intelligence organisations, spy rings, agent-running and all the other aspects of wartime spying. Classified "Top Secret" in its day, this manual was only fully declassified in the past few years.

This is near-perfect reproduction of the original publication with all wartime classification markings intact.

With the originals all but extinct outside the US National Archives' OSS collection, this series is a must-have for any military scholar or for special operations or intelligence community personnel wishing to honor their heritage.

The titles available in this series include:

• Special Operations Field Manual
• Operational Groups Field Manual
• Simple Sabotage Field Manual
• Secret Intelligence Field Manual
• Morale Operations Field Manual
• Maritime Unit Field Manual