I know this is old, but there have been recent studies on these guys as the units in NORSOF are among the very best worldwide. Experienced operators who had several deployments to Kabul, and went through tens of such extreme large-scale terrorist attacks had not only higher openness to experience and extroversion, but also higher general belief in humanity and the world.

This in large stems from experiencing the worst aspects of humanity, while simultaneously experiencing complete mastery and morality of the self. As the self is also a part of humanity, the experiences dud not break the individual operators world-view/ psychology/ spirit, but strengthened it.