| Business | Phone |
| British Security Group 12801 Worldgate Dr, Herndon 20170 | (571) 203-7150 |
| Cbr Security 12627 Builders Rd, Herndon 20170 | (703) 471-8050 |
| Elpas North America 560 Herndon Pkwy, Herndon 20170 | (703) 707-2027 |
| Vindicator Technologies 13003 Bankfoot Ct, Herndon 20171 | (703) 860-9690 |