By no means an empirical study, not all that wide ranging, in my experience special operations folks, atleast the younger ones I interacted with, seem to have this attitude of invincibility down pretty pat. This is not to bash, I myself use to think that no Taliban fighter intent on meeting Allah was going to get the best of me. It was goes with being 21 and hyped up on America choose.
Furthermore, my Father, whos was a carreer Air Force NCO, and was a PJ before anyone thought of wearing a red beret, said that some of the most foolish things he saw in his thirty plus year carreer were some stunts pulled by various commandoes.
This should serve as a reminder to all that none of us are infallible and to allways adhere to the four always rules.