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USARV-SOG operating in Cambodia.
Episode 3377 of the Vietnam Veteran News Podcast will feature a story by Mack Payne about Project Gamma and the long gone spy.
Payne reported that Project GAMMA and the Long-Gone Spy is one of the most secretive and controversial stories of the Vietnam War, involving the legendary U.S. Army Special Forces Green Berets, MACV-SOG, and a South Vietnamese intelligence agent named Thai Khac Chuyen.
Operating in the shadows of the Vietnam War, Project GAMMA was a highly classified intelligence operation focused on gathering information about North Vietnamese Army and Viet Cong activity, particularly Communist operations connected to Cambodia. The mission demanded extraordinary courage, secrecy, intelligence gathering, and unconventional-warfare skills.
The Green Berets of the 5th Special Forces Group were uniquely prepared for this dangerous environment. These highly trained Vietnam veterans served as intelligence specialists, advisers, reconnaissance experts, guerrilla fighters, and unconventional-warfare professionals. Working alongside Vietnamese personnel and indigenous forces, they developed intelligence networks and gathered information deep inside enemy territory.
The case surrounding Thai Khac Chuyen, who became known as the “long-gone spy,” eventually led to a major military controversy. Concerns about double agents, disappearing intelligence sources, and the security of the GAMMA network resulted in the arrest of Colonel Robert Rheault and seven other Special Forces officers. The case ultimately collapsed after the CIA declined to testify, and the charges were dropped in September 1969.
But the controversy does not erase the remarkable service of the men who served in U.S. Army Special Forces, 5th Special Forces Group, and MACV-SOG.
These Vietnam Green Berets fought a different kind of war—one where intelligence could be as important as firepower and where trusting the wrong person could cost American lives. Their missions required courage, discipline, sacrifice, intelligence, and extraordinary resourcefulness.
The story of Project GAMMA and Thai Khac Chuyen provides a rare glimpse into the secret war in Vietnam and the incredible men who served in America’s Special Forces. Their service and sacrifice deserve to be remembered and honored.
Listen to episode 3377 and discover more about Project Gamma and the long gone spy.
























