Interesting photojournal here about the Army's SERE school. Apparently CNN spent some time at Bragg sometime in 2002 and did a CNN Presents on the survival school. What I found most interesting was the hormonal study data presented. And the fact that there are cadre present that have suffered through captivity their own selves.
On the hormone stuff, though, I'd say that it's a pretty bold statement to make that SF guys have a "biological profile" that makes them cool under fire. Most of the smart guys I've spoken to about genetic predisposition for combat performance were adamant that the jury is still out on the whole nurture or nature question (warning, don't click on that link unless you really, really want to get your geek on. Just take my word on it).
Oh, and in researching for this post, I heard that that Elmer Adams guy that's quoted is a Son Tay Raider. Yuh, I guess that gives him creds on talking about stress inoculation.
And, while we're talking about all things SERE, here's a pretty cool tale of Monopoly games with a real "get out of jail free" card. Good stuff.