Force protection is in everyone's lane. Whether he should have done what he did or not is now irrelevant. He identified a potential security breach and now it needs to be addressed; although it should have been done then.
Speaking as one who has performed security guard duties, using another's ID to gain access isn't screwing with someone if they're doing their job. If it had been me, rest assured he wouldn't have gotten in with another's ID. I would have turned him away and would have made him use another entrance just to show him that I'm master of my domain (General Order #12 is always in effect).
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