Yes, we did. I can look up the specifics (or maybe @kritiper knows them; he’s crafting a response right now), but my recollection is that the Americans pulled out and left them to their fate when the Khmer Rouge began their attacks in April of 1975. Was it also the case that some of the bombing we did in Vietnam actually struck part of Cambodia? I’m less sure of that, but something of that sort occurred. The Khmer Rouge slaughtered about a million of their fellow countryfolk, as I recall, and we did nothing to intervene. They also forced people out of the cities, sent them to the countryside with no way to feed and house themselves, sent them to “reeducation” camps, and much, much more. Action in Vietnam received a lot of coverage, but what happened in Cambodia was basically ignored. As I understand it. I apologize if I have my facts wrong and hope someone will set me straight. But around the 10-year anniversary of the onslaught, I read three or four books on the subject of what happened in Cambodia under the Khmer Rouge, and this is how I remember it.