Aerospace, while technically referring to the atmosphere of Earth and surrounding space, is usually used for the industry that does research, designs, manufactures, operates, and maintains vehicles moving through air and space. This industry has many applications in a number of sectors, notably military, commercial and industrial. This industry has presence in Midland. This industry has both public and private entities (e.g, NASA in USA). Some prominent companies in this sector, which also have a presence in space research, include Boeing, EADS, Lockheed Martin, MacDonald Dettwiler and Northrop Grumman. Typically, this industry is involved in research and manufacture of aircraft, guided missiles, space vehicles, aircraft engines, propulsion units and other parts involved in the same. Some instruments manufactured by this sector include cockpit interface, electrical power management, engine solutions, fuel systems, hydraulic systems, motion control. Some other companies specialize in communications, electronic engineering, frequency standard characterization, global positioning system, information assurance, softwares, sensor systems and telemetry processing.