Good points all! I have repeatedly tried to get my current employers to put a guard at the door simply to prevent tailgaters and buddy swiping, which are a recurring problem here.
One of the more regrettable incidents in my aerospace career was unintentionally getting a security guard fired. I was in a hurry and needed to get into a highly secure area, and, well, the guy recognized me as having had the requisite clearance a month or two previously. I still feel guilty.
