GardaWorld
Mc Lean, VA 22101
Inter-Con Security Systems
Washington, DC 20001
Diversified Protection Corporation
Alexandria, VA 22314
Allied Universal
Columbia, MD 21044
Apex Systems
Washington, DC 20032
Strategic Security
Hyattsville, MD 20783
M.C. Dean
Washington, DC 20001
US MAIN PATROL DIVISION
Washington, DC 20001
Golden Tech Systems
Washington, DC 20001
ST. MORITZ SECURITY SERVICES
Arlington, VA 22201