I worked for PGS, now SCIS, for just over 4 years. In my time there, I was responsible for the daily ingress and egress of vehicle traffic as well as the occasional shift at the front desk in one of the auxiliary buildings. I learned a great deal about national security and the need for secrecy.
My coworkers were, and still are, excellent employees. They take their job very seriously and maintain a tight security presence. My manager was firm but fair. His employee's well-being came first after site security.
The hardest part of the job would definitely be keeping busy. The monotony of nothing happening for long stretches at a time can, and will, wear even the strongest-willed person.
The most enjoyable part of the job was walking patrols. It was an opportunity to be able to stretch your legs after working a post for several hours at a time.
On-site cafeteria's, on-site showers