The pajamas claim was from the VC in Ca Mau, who gave differing answers to Nightline and to the AP reporter who interviewed them a month or two earlier. The Vietnamese Communists are notorious liars (and I say this as the husband of a S. Vietnamese woman who grew up on the Delta).
As for Rassman's claim, I'll cut him slack and say that he confused friendly fire for enemy fire in the heat of battle. All the other SWIFTees say he's wrong.
I cut Rassman slack too. He struck me as a pretty naive guy who was seriously being taken advantage of by Kerry's handlers.