There is no known record of the U.S. sending a hit team into Cambodia to kill Colonel Reault. However, there was a controversial incident involving Colonel Robert Rheault, a U.S. Army Special Forces officer, during the Vietnam War. He was implicated in the Green Beret Affair, where U.S. Special Forces executed a suspected double agent, Thai Khac Chuyen, in 1969.
This operation was part of Project GAMMA, a covert intelligence program that operated in Cambodia and Vietnam. The program was highly effective in gathering intelligence on North Vietnamese activities, but it was shut down after the execution incident.