| PROJECT GAMMA US Army | |
|---|---|
 Det B57 "Project GAMMA" Unofficial insignia | |
| Active | 1968–1970 |
| Country | United States of America |
| Branch | United States Army |
| Type | Covert Operations |
| Role | Intelligence |
| Size | Detachment, 6 US, 460 Indigenous personnel |
| Part of | 5th SFGA RVN 1968–70 US Army Special Forces SSI c. 1970 |
| Engagements | Vietnam War (Cambodia) |
Project GAMMA was the name given in 1968 to Detachment B-57, Company E (Special Operations), 5th Special Forces Group (Airborne) (5th SFG(A)) in Vietnam from 1967 to 1970. It was responsible for covert intelligence collection operations in Cambodia. The teams were highly effective at locating Viet Cong operations in Cambodia, leading to their destruction. When assets began to disappear, they identified a South Vietnamese officer as the mole. On the advice of the CIA, they took extrajudicial steps and murdered him. Seven officers and one non-commissioned officer were arrested and tried. When the CIA refused to answer summons for witnesses for national security reasons, the charges were dropped.