I do not agree that a military, ex-military, border agent, or other law-enforcement agent's inherent personality can be separated from his personality "on the job".

All sorts of executive-branch military or law enforcement posts seem to encourage "us vs them" thinking, while shifting the bright line in the "us" direction. Accepted norms become narrower, while "the other" becomes correspondingly broader.

That change is not confined to on-the-job attitudes and behaviors.