Operational Group Command (OG), was a branch of the Office of Strategic Services during World War II that specialized in guerrilla warfare and independent operations against designated Axis targets.

[1] The original A Teams of US Army Special Forces, Operational Detachments Alpha (ODA), are modeled after the successes of Operational Group Command and its groups.

[2] William Donovan and Millard Preston Goodfellow were concerned with creating guerrilla units within SA/G as early as December 1941.

[2] The OGs had a dual leadership command structure.

[3] While OGs were deployed in the field, they were under the tactical planning authority of the Theatre Commander, and the strategic planning authority of the Director of the OSS, William Donovan.