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Military Assistance Command, Vietnam – Studies and Observations Group (MACV-SOG) was a highly classified, multi-service United States special operations unit which conducted covert unconventional warfare operations prior to and during the Vietnam War.

The Military Assistance Command, Vietnam, Studies and Observations Group (MACV-SOG) was activated, January 24, 1964, to function as a joint special operations task force. Commanded by a U.S. Army Special Forces colonel, MACV-SOG was a subcomponent of MACV.

The First American Helicopter Unit attached to Project Delta was 145th Airlift Platoon. Although the 145th provided support in 1965, the 145th Air Lift Platoon Direct supported of Delta Operations shows up in After Action Report (AAR) for Operation 1-66 (Binh Hoa). After consolidation of multiple Aviation Units the 145th was finally absorbed into what was to be known as the 281st Assault Helicopter Company (10th Combat Aviation Battalion, 17th Aviation Group (Combat), 1st Aviation Brigade), which was placed under operational control of the 5th Special Forces Group in direct support of Project Delta operations in I and II Corps. The 281st AHC provided dedicated helicopter support from December 1966 and their support ended in Dec 1969.

The Military Assistance Command, Vietnam, Studies and Observations Group (MACV-SOG) was activated, January 24, 1964, to function as a joint special operations task force. Commanded by a U.S. Army Special Forces colonel, MACV-SOG was a subcomponent of MACV.