Northrop Grumman Corporation has appointed Robert J. Mehltretter as vice president of the company's Navigation and Positioning Systems (NAPS) business unit. In his new position, Mehltretter will have executive responsibility for all domestic and international programs within the NAPS business area, which is a leading provider of inertial navigation and positioning systems and sensor technologies for fixed- and rotary-wing aircraft, missiles, spacecraft, ships and land vehicles.