On May 1, 1970, US ground forces crossed over from Vietnam into Cambodia in an operation announced by Nixon the previous evening on national television. They joined South Vietnamese (ARVN) forces that had begun the incursion two days before, mainly in the border regions known as the Parrot’s Beak and the Fishhook. The purpose was to disrupt communist safe havens and destroy weapons caches, and a primary goal of the mission was to locate and destroy the elusive communist headquarters. It was known that the red leaders kept the various elements of their command structure widely scattered and also moved them frequently. Their strategy proved effective since the HQ was never located. They also minimized their causalities by avoiding pitched battles against the massive firepower of the US/ARVN forces. The most successful outcome of the operation was the location of significant amounts of enemy weapons, ammunition, and food. Most of this was turned over to the Cambodian armed forces. That ...