Id make some stuff up

Tell people you have a few scars from all the action you have seen. Perhaps a few stories about gun fights, or maybe about the time you had to kill a man Chuck Norris style to keep him from attacking the plant.
I know all about the security even though I have yet to step foot inside a plant. The funny with the nuclear world is, half of the things you can't do is because of security reasons, and the other half is because they don't want to file the paper work. With nuclear.. there is a lot of paper work.
We give plant tours to customers and other such visitors at times. When we do we have to be careful. Non employees are not allowed to see the assembly areas where we make valves for nuclear subs. The navy does not want anyone to see them for fear they might learn how to compromise a sub.
Our security unit however is not so advanced. Its one guy. Kinda old, kinda fat. Spends most his time chasing teenagers around the property, or sleeping in his car.