- A & E Home Security
 - Bethesda - Offers home and office security equipment for the do-it-yourselfer. - Civitas Group
- Consulting firm offering a range of advisory services to private sector and government clients in the homeland security field.
- Colorado Security Agency, Inc.
- Professional security service serving the Metropolitan Area (MD, VA, DC).
- D&D Security Training Academy
- Alexandria - Classes include private investigation and firearms training. Also offers armed security services.
- Dave's Lock and Alarm
- Waldorf - Selling locks and alarm systems for home and business security.
- DielectroKinetic Laboratories
- Vienna - Manufacturer of LifeGuard handheld detectors.
- Higgins, Clay E.
- Dunn Loring - Security management consultant.
- International Biometric Industry Association
- Trade association advancing the interests of the biometric industry. Offers public information and advocacy on behalf of biometric manufacturers, integrators and end users.
- International Consultants
- Investigation and security agency.
- Kastle Systems Inc
- Arlington - Building services, security, and access control.
- Lennon Security Corporation
- Rockville - Wide array of experiences include countermeasures, executive security assessments, security project management, special events, and intrusion detection.
- MCQ Associates, Inc.
- Fredericksburg - Products including surveillance and remote sensors.
- National Burglar and Fire Alarm Association
- Bethesda - The burglar and fire alarms, access control and closed circuit TV home page.
- Nova Security Services
- Vienna - Specialises in technical surveillance countermeasures.
- Operational Tactics
- Gaithersburg - Provides sniper, SWAT, hostage rescue training.
- Ross Engineering, Inc.
- Sterling - Offering countersurveillance and privacy protection services, including consulting, expert witness, seminars, training, and equipment.
- SecurityNet
- Network of independent security integrators providing monitoring, consulting, training, support services and more.
- Seenex Corporation
- Seenex provides integrated security solutions, and a platform for secure building access control, including designing, building, and servicing the system and training its clients.
- Virginia Safe and Lock Service
- Springfield - Commercial and residential security company provides and installs safes, locks, electrical access control systems, exit devices, and key duplications.
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