Demval Inc

Founded in 1881, Professional Service Industries is one of the largest firms providing engineering, scientific, technical and management solutions in the United States. The company serves public and private sector clients involved with site selection, design, construction and property management. It also provides a variety of specialty engineering and testing services. Professional Service Industries employs more than 2,500 individuals in over 125 offices throughout the U.S. The company offers environmental consulting, asbestos management and industrial hygiene services. It serves the educational, financial, health care, retail, transportation and entertainment industries. The company additionally performs liquid penetrant, magnetic particle, visual, radiographic and ultrasonic inspections. Headquartered in Oakbrook Terrace, Ill., Professional Service Industries maintains a location in Oklahoma City.

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Northrop Grumman Corporation is a worldwide defense company. The company provides a range of products, services and solutions for the systems integration, defense electronics, information technology, advanced aircraft, shipbuilding and space technology markets. Its shipbuilding segment designs, builds and refuels nuclear-powered aircraft carriers and submarines. Northrop Grumman Corporation also performs services for a variety of naval and commercial vessels. The company operates in more than 25 countries throughout the world. It employs a staff of over 120,000 employees in nearly 10 business divisions. Northrop Grumman Corporation serves the international military, government and commercial industries. The company s subsidiaries include Northrop Grumman LITEF and General Dynamics Corporation. It offers inertial sensors and navigation systems for military and civil space satellites. Northrop Grumman Corporation provides life cycle support programs the U.S. Navy and the U.S. Coast Guard.