Hello.
GSA does not have anything to do with the Ed Brown operation. Those "GSA" vehicles that you are seeing are vehicles leased by GSA. GSA basically supplies the government with contracting services, supply services, technology services, building management services and fleet vehicle services. GSA is the U.S.A.'s largest vehicle leasing entity even if you compare GSA to the private sector rental car companies. And yes, we do have a law enforcement division which is in charge of guarding some U.S. Government buildings.
Jason