| Business | Phone |
| Condortech Services 7018 Evergreen Ct, Annandale 22003 | (703) 916-9200 |
| Estech 7617 Little River Tpke 400, Annandale 22003 | (703) 642-9700 |
| Global Security Svc 4504 Mullen Ln, Annandale 22003 | (703) 764-0333 |
| Uriel Systems Inc 4231 Markham St, Annandale 22003 | (703) 256-1518 |