Orbital Sciences Corp. reached an agreement to acquire the spacecraft development and manufacturing business of General Dynamics Corp.’s subsidiary, GD Advanced Information Systems. The acquisition enhances Orbital’s position in the growing market for national-security space systems, including spacecraft used in intelligence and surveillance, missile tracking, space situational awareness, and other operational defense missions. General Dynamics’ spacecraft unit is located in Gilbert, AZ, 10 mi from Orbital’s launch-vehicle engineering and manufacturing facilities in Chandler. Upon closing of the acquisition, about 325 new employees will join Orbital, most of whom are engineers, technicians, and program managers. As part of the transaction, Orbital will also acquire a 135,000-ft² space-systems manufacturing, integration, and test facility.