In my very, very limited experience, I’ve known 3 SEALs (we went through OCS* together) and I worked for a Naval Aviator who spent almost 5 years in the Hanoi Hilton. All four of these men were, interestingly enough, easy-going and rather congenial. The SEALs were probably in their late 20s, but they never seemed to feel the need to prove anything - they’d proven it by becoming SEALs. The aviator had the sunniest outlook of anyone I ever knew - not a fakey “lollipops and rainbows and puppies” attitude, but it was obvious that after the hell he’d been through, nothing life threw at him was a big deal.
And while this is a very unscientific sample, I’ve heard similar anecdotes from other people.
On the other hand, a close friend who was shot by a nutcase at work (line of duty, but not a war or anything) seemed to revel in the attention he could bring to himself by showing his scars and (believe it or not) the scrapbook that included his xrays showing the bullets inside him. For all his protestations that he didn’t want to dwell on it, he most certainly did. So I guess experience and personality both determine what kinds of “war stories” a vet will share.
Incidentally, you know the difference between a fairy tale and a sea story? The sea story begins: “This is a no-shitter…”
*Yes, they were SEALs in OCS. We were all prior enlisteds going over to the dark side.