KBR Corporate Headquarters, Texas

KBR (formerly known as Kellogg, Brown and Root) is an international construction, engineering, and infrastructure company, focusing on oil, natural gas, and military-related contracts (they claim to be the largest contractor for the U.S. Army). It was formed by the integration of Brown and Root, a road building company that grew into a diversified construction company as a subsidiary of Halliburton over 44 years, and the MW Kellogg Company, a construction and engineering company specializing in refineries and power plants. In 2007, KBR, became independent of Halliburton. It is still headquartered in Houston.