This article presents a history of the United States Army Special Forces, founded in 1952
Some of the Office of Strategic Services have much more similarity in terms of mission with the original U.S. Army Special Forces function, unconventional warfare (UW), acting as cadre to train and lead guerrillas in occupied countries. The Special Forces motto, De oppresso liber (Latin: "to free the oppressed") reflects this historical mission of guerrilla warfare against an occupying power. Specifically, the three-man Jedburgh teams provided leadership to French Resistance units. The larger Office of Strategic Services "OSS" Operational Groups (OG) were more associated with SR/DA missions, although they did work with resistance units. Colonel Aaron Bank, considered the founding commander of the first Special Forces Group created, served in OSS during World War II.
Another unit widely associated with the origins of the Army Special Forces was the First Special Service Force, a joint Canadian-American unit formed in 1942 and disbanded in 1944. Members of the First Special Service Force were retroactively awarded the Special Forces Tab upon its creation in 1983 for their part in Special Forces' history. Each year, a joint 1st Special Forces Group-Canadian Special Operations Regiment exercise, known as Menton Week is held to commemorate the historical link that both units share in the First Special Service Force.
While Filipino American guerrilla operations in the Japanese-occupied Philippines are not part of the direct lineage of Army Special Forces, some of the early Special Forces leadership were involved in advising and creating the modern organization. They would use what they have learned fighting as a guerilla unit in the doctrine of unconventional warfare in the Special Forces. They included Russell Volckmann, who commanded guerrillas in Northern Luzon and in Korea,Donald Blackburn, who also served with the Northern Luzon force, and Colonel Wendell Fertig, who developed a division-sized force on Mindanao.