For firsthand testimony by American soldiers involved in similar operations — I cannot recommend Winter Soldier, the 1972 documentary film, highly enough.

It's something that every American adult deserves to see.

Part 1: http://www.dailymotion.com/video/x67rpbi

Part 2: http://www.dailymotion.com/video/x681bui

In short: The film records a 1971 Vietnam Veterans Against the War event in Detroit, where dozens of veterans spoke in public, to the media and on the record, for the first time, about war crimes that they had seen and taken part in, just months or years before.