URS Corporation

Flint Energy Services, Inc. provides integrated midstream production services to the energy and resource industries.

CATI Training Systems specializes in the development of advanced visual image generation systems and high-fidelity visual simulation terrain databases tailored for both commercial and military simulators. The company's products, including X–IG™, X–100™, and X–TUAS™, are designed around industry-standard technologies such as OpenGL™, a high-performance graphics API, and OpenFlight™, the 3D standard for visual simulation. These image generators operate on commercially available PC-based hardware and software, compatible with Windows and Linux operating systems. CATI Training Systems focuses on providing high-quality simulation solutions that facilitate the training of civil, commercial, and military pilots.

Apptis is a provider of advanced IT solutions and services, primarily catering to government and defense sectors. The company delivers high-end IT services to the U.S. Defense Department, encompassing all branches of the military and the Defense Information Systems Agency. In addition to its defense-focused offerings, Apptis serves civilian agencies and transportation clients globally. Its comprehensive range of services includes secure cloud computing, integrated cyber solutions, software and system engineering, enterprise management, network engineering, and program management. Through its expertise, Apptis aims to enhance operational effectiveness and security for its clients.

Scott Wilson Group plc is a global integrated design and engineering firm for the built and natural environments. With its headquarters in the United Kingdom, the Group has a worldwide network of 80 offices and more than 5,500 employees. Scott Wilson offers strategic consultancy and multi-disciplinary professional services in the railways, buildings & infrastructure, environment & natural resources and roads sectors. Scott Wilson’s principal operating regions are the United Kingdom, Asia-Pacific, Europe, India and the Middle East, with regional centers in London, Hong Kong, Warsaw, New Delhi and Dubai.

Washington Group International, doing business as AECOM Energy & Construction, Inc., provides professional engineering services. The company specializes in heavy construction like bridges, tunnels, and elevated highways. AECOM Energy & Construction has customers across the world. Aecom Energy acquired Urs Energy in 2014 Urs acquired Washington in 2007.

EG&G is a consultancy firm that provides its customers with design services and funding strategies. The company offers a broad range of services such as program management, planning, designing, engineering, construction, operations, and maintenance to its customers. EG&G also engages in developing financial plans for its clients, including grant makings and securing funding sources. EG&G was founded in 1981 and is headquartered in Gaithersburg, Maryland.

Dames & Moore is a worldwide engineering and construction services firm, whose capabilities include general engineering and consulting, process and chemical engineering, transportation planning and design, and construction services.

Thorburn Colquhoun Holdings plc, a leading civil/structural engineering consulting firm based in the United Kingdom.

Woodward-Clyde Group was an engineering firm.

Greiner Engineering, Inc. operated as a professional services firm.

E.C. Driver & Associates is a transportation engineering firm specializing in bridge and highway design, including particular expertise in moveable bridges.