 Other major defense contractors with DFW presence include Boeing (Richardson), Rockwell Collins (Richardson), Vought Corporation (headquarters in Dallas; facilities in Dallas and Grand Prairie), Raytheon (plants in Garland, Dallas, and McKinney), L-3 Communications (plants in Arlington, Carrollton, and Greenville; also has a facility in Waco), BAE Systems (facility in Fort Worth), Leonardo DRS (Dallas), Hewlett Packard Enterprise and NTT Data (Plano), Alliant Techsystems (facility in Fort Worth), and Elbit Systems (facility and US headquarters in Fort Worth).The Defense Contract Audit Agency maintains its Central Region office in Irving.Outside the DFW area, KBR (the former Halliburton subsidiary) maintains its headquarters in Houston, while the Southwest Research Institute is located in San Antonio.