[speeder]

There are some retired Navy officers here who know a lot more but I've seen a documentary about SEALs plus know a couple. Their training is so tough that there is absolutely no way on earth to know whether any individual will complete it without actually trying. The washout rate is huge and almost everyone who tries is a super athlete/swimmer, tough as nails, never quit type, etc., etc...

A neighbor I grew up with was a SEAL team dive instructor, (talk about badass), he spent a lot of time training members of the other services in diving, stuff like that. You would never guess if you met him that he has that background, he's a fit middle aged guy but that's about it from appearances. Very soft spoken. Great guy.

Best of luck to him but that sounds like a risky gambit that might not pay off.