Why would this guy lie to me he was a good solid guy with no reason to lie
I have no idea. But he should have chosen a less well documented story, the points of which are very specific, Either way, the original tale was a fantasy, he has told you what he has read in a book, pretty much word for word, looking back at the responses the story was recognised by a number of people as being the B20 story. Unless your biddy is a Brit ex special forces guy, he simply plagiarised the book to make himself into something he is not. In fact if he is an ex British Special Forces soldier, he is still a liar because the story was a complete figment of Mcnabs imagination, I would bet if you asked your mate he would tell you that his mates were called Stan and Dinger, Chris, Legs, Bob, Vince and Mark. Either ignore him, or better still show interest and awe, get him to elaborate and then smack him in the chops with a copy of the book.