Military Assistance Command, Vietnam Studies and Observations Group (MACV-SOG) was the most top secret unit of the U.S. Military during the Vietnam War. Consisting of elite operators from various ...

SOG Teams were usually inserted by helicopter, and often included the support of Hatchet Force platoons composed of South Vietnamese commandos (often from the Nung Chinese and Montagnard minorities).

SOG was responsible for covert cross-border operations into South Vietnam's neighbors ... Due to the high risk involved in these covert operations, all SOG teams were considered "deniable assets." If ...