- Mitretek Systems
 - Nonprofit systems engineering company specialising in information and environmental system technologies. - Anteon
- Fairfax - IT and engineering services company providing support to the federal government, commercial, and international sectors.
- TransOrbital, Inc.
- Alexandria - TrailBlazer lunar orbiter, authorised by U.S. for commercial flights to the Moon, to conduct lunar exploration and mapping, as well as delivery of scientific and personal items.
- VSE Corporation
- Alexandria - Professional services company providing diversified engineering, development, testing, and management services to government and commercial customers worldwide.
- DCS Corporation
- Provides products and systems for commercial customers, Department of Defence, and government agencies.
- Hessler Associates, Inc.
- Cabin John - Provides acoustical consulting services to the power industry.
- Techno-Sciences, Inc.
- Lanham - Provides software development, control systems design, and engineering services to government and industry, including ground systems for COSPAS-SARSAT search and rescue satellites.
- Eagan, McAllister Associates
- Lexington Park
- Electronic Instrumentation and Technology, Inc.
- Sterling - Instruments for UV curing applications and Compact Disc manufacturing.
- Science Systems and Applications, Inc.
- Lanham - Scientific, technical and engineering support services for government and industry.
- Gryphon Technologies, L.C.
- A marine engineering firm.
- Rhein Tech Laboratories, Inc.
- Herndon - In the EMC compliance engineering and testing business since 1988, and we run three shifts, 24 hours a day, to keep things moving.
- Dwyer Engineering
- Leesburg - Mechanical, plumbing and electrical engineering of building systems.
- Datasoft Corp.@
- Gaithersburg
- MAR Incorporated
- Rockville - Provides expertise in ocean, naval and marine engineering; electronic and electrical engineering; computer science; oceanography and meteorology; operation and maintenance of vessels.
- Omitron, Inc.
- Beltsville - Provides aerospace engineering and information technology support to government, universities, and industry partners.
- George G. Sharp, Inc.
- Alexandria - GGS provides support in naval architecture, marine engineering, ship surveys, ship design, marine damage control, and ship survivability.
- Global Systems & Strategies, Inc. (GSS)@
- Potomac
- Henry Adams, Inc.
- Mechanical and electrical engineering services.
- GeoMetrics GPS, Inc.
- Fredericksburg - Serving the evolving surveying, mapping and spatial information community.
- Search-in-Print
- Bethesda - Contains abstracts or digests of recent journal articles, monographs, patents, and reports on specialised materials and metals engineering topics.
- Arion Systems, Inc.
- Vienna - Systems and marine engineering consulting firm specialising in telecommunications, marine dynamic analysis, mechanical design, and underwater sensors.
- Systems Integration & Research, Inc@
- Product Engineering & Mfg., Inc.
- Linden - Providing concept, industrial design, product development, engineering, custom enclosures, mechanisms, inventions and prototypes for the industrial and commercial markets.
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