In 1965, nearly 400 US warplanes attempted to wipe out COSVN in an aerial attack, but had no effect on the elusive shadow command. Near-daily B-52 raids against its headquarters in Memot, Cambodia failed to kill any of its leadership and insertion of US / RVN Special Forces teams usually wound up dead or returning with heavy casualties, and it was described as "poking a beehive the size of a basketball". COSVN and CO continued to exist, evolving into the Provisional Revolutionary Government of the Republic of South Vietnam in 1969, and narrowly avoided capture of its entire headquarters by ARVN and Cambodian forces during the Escape of the Provisional Revolutionary Government but still maintained its direct activities as serving as a Hanoi intermediary.