After a lifetime of military and LE service and experience, this stuff just comes naturally to me. In fact, my wife knows exactly where to sit when we go out to eat. I’m always scanning my surroundings. A few times I’ve seen individuals who seemed to looking for a victim. But once they know I see them, they lose interest in me. It also helps that I’m tall and broad shouldered and I have “that look”. I can’t count the number of times I’ve been traveling and I’m walking down the street and a hooker asks me if I’m a cop.
I'm not a cop, but I used to get asked that all the time. I got that when I was a 19 year old kid before I went to MCRD even. I still get it every once in a while.