David N. Walker

LCC International, Inc. provides engineering and network services for the telecommunications industry. It offers planning, design, deployment and ongoing operations and maintenance of wireless networks to wireless service providers, satellite service providers, telecommunications equipment vendors, systems integrators and tower companies. The company was founded by Rajendra Singh in 1983 and was headquartered in McLean, VA.

CERBCO, Inc. repairs underground sewers and pipelines. The private company is based in Landover, MD.

Horwath Velez & Co. PSC is a private company based in Washington.

BAE Systems, Inc. provides support and service solutions for defense, intelligence and civilian systems. The firm offers ship repair, maintenance, modernization, conversion and overhaul services for the U.S. Navy, government, commercial and private customers. It operates full-service shipyards in Alabama, Florida, California, Virginia and Hawaii. The company was founded on November 30, 1999 and is headquartered in Arlington, VA.

ZF Automotive US, Inc. supplies automotive systems, modules and components to automotive original equipment manufacturers and related aftermarkets. Its products include integrated vehicle control and driver assist, braking, steering, suspension, occupant safety systems, electronics, engine components, fastening systems and aftermarket replacement parts and services. The company was founded in 2002 and is headquartered in East Lansing, MI.