Inside America's First Special Forces: How OSS Operational Groups Pioneered Modern Unconventional Warfare

A newly surfaced declassified report reveals the untold story of the Office of Strategic Services' Operational Groups—the elite combat units that served as the direct predecessors to today's Special Forces. This comprehensive 11-page intelligence assessment details how these small, highly trained teams conducted some of World War II's most daring behind-enemy-lines operations across four major theaters of war.

When President Franklin D. Roosevelt established the Office of Strategic Services in 1942, America lacked any coordinated intelligence or special operations capability. Under the leadership of William "Wild Bill" Donovan, the OSS rapidly developed multiple branches—from intelligence gathering to propaganda operations. Among its most innovative creations were the Operational Groups, small military units typically composed of 15-30 men trained in guerrilla warfare, sabotage, and working with local resistance movements.

Unlike the OSS's intelligence operatives who worked in the shadows, Operational Groups were combat units designed to operate openly behind enemy lines. Working closely with the British Special Operations Executive (SOE) and alongside the famous Jedburgh teams, these units received intensive training at facilities like the mysterious "Training Area F" before deployment. The Joint Chiefs of Staff initially viewed these unconventional warriors with skepticism, but commanders like Eisenhower and MacArthur quickly recognized their unique value in theaters where conventional forces couldn't operate effectively.

This declassified report reveals the remarkable scope and effectiveness of OG operations across multiple continents. In Italy, these teams worked alongside local partisans to harass German supply lines and gather intelligence for the 15th Army Air Force. Greek operations saw OGs coordinating with resistance fighters to tie down entire German divisions that might otherwise have been deployed against Allied forces. Perhaps most dramatically, the document details OG support for the French Maquis, where American teams helped transform scattered resistance cells into effective fighting forces capable of supporting the D-Day landings and subsequent liberation campaigns.

The report also illuminates the human cost of these operations, documenting both spectacular successes and tragic losses. Under the operational leadership of figures like Colonel Russell B. Livermore and Lieutenant Colonel Alfred T. Cox, OG teams pioneered tactics and operational concepts that would later become standard doctrine for U.S. Special Forces. The document reveals how these early special operators developed techniques for air insertion, working with indigenous forces, and conducting extended operations with minimal support—all hallmarks of modern special operations.

The legacy of OSS Operational Groups extends far beyond World War II. These units served as the direct organizational and doctrinal ancestors of the Army's Special Forces, established in 1952 by veterans of OSS operations. Today, as U.S. special operations forces conduct missions worldwide, they employ tactics and strategies first developed by OG teams operating in occupied Europe and Asia. The emphasis on cultural understanding, language training, and partnership with local forces—core principles of modern counterterrorism and irregular warfare—traces directly back to these World War II pioneers.

Understanding this foundational period of American special operations provides crucial context for contemporary military strategy and the ongoing evolution of unconventional warfare in an increasingly complex global security environment.

Explore the complete OSS Operational Groups intelligence report and over 5,000 other declassified documents at Intelligence Archive: https://intelarchive.com/documents/ad94bf1d-070d-46ae-84d4-2fd12425a237