The OSS, Explained

The Office of Strategic Services was the United States’ first centralized intelligence and special operations agency, stood up in 1942 under William J. Donovan and dissolved in 1945. In barely three years it ran foreign intelligence, analysis, sabotage, morale and propaganda operations, and guerrilla warfare alongside resistance movements across occupied Europe and Asia. Its people and its methods became the foundation of both the Central Intelligence Agency and Army Special Forces.

The documents in this collection are that wartime doctrine in its original form, the field manuals, reports, and assessments the OSS wrote for its own operators. Read together, they show modern irregular warfare at its point of origin, before the craft was divided among separate institutions and buried under decades of later practice. Each card below records where the document came from, its date, and its declassification history.

Why Study the OSS

The OSS compressed the full craft of unconventional warfare into a handful of wartime years, which makes its record unusually legible. One organization built foreign intelligence, covert action, and partisan support from almost nothing, wrote down how it did so, and left a paper trail that later agencies spent decades elaborating. For the practitioner, these manuals are a primary-source baseline for how a state generates irregular capability under real pressure and short timelines.

For the student and the historian, the OSS is the common root of two modern lineages, CIA covert action and Army Special Forces, captured before either had hardened into its own bureaucracy and vocabulary. The accounts below add operational history, biography, and analysis around the primary documents above, and are a sound place to go deeper.