>> thompson: the fighter confirms what i'd heard earlier, that hoang co minh was even willing to kill men. >> thompson: so you think about ten people are buried up there. >> thompson: 30 years ago, a guerrilla army led by hoang co minh, an american citizen, used this jungle as a base to launch attacks on vietnam. somewhere in these mountains could be the remains of front soldiers, murdered by their own group. in the dry season, it would be a day's march from the nearest village. but the rains have begun, and no one will risk guiding me up there. i've learned all i can here. ♪ back in the u.s., the story is becoming more clear. i hear from richard armitage, who's now a consultant in washington. he won't meet with me, but in a series of emails, he says he personally vouched for hoang co minh to his thai counterparts as the front was trying to set up its operations. but however helpful that was, he insists the u.s. did not have a program of support for the front. i also learn armitage wasn't the only one who knew about the front's war efforts. i find cia cables showing the agency was awa