We use National Security Service for a school trip every spring, to help keep overnight shenanigans from the students down.
Paul (our guard in Houston this year) was very easy to work with, and would gladly use him again the next time we are in the area. He was always prompt, polite, and had a smile on his face.
Shamicqua (our service rep) has always been a joy to talk to, and gets quotes and information back to us very quickly.
Our overall experience with National Security Service has always been top notch, and this year was no exception