NASA's Dryden Flight Research Center awarded a five-year contract to Northrop Grumman Corp. for engineering and technical services to support NASA's use of Global Hawk unmanned aircraft for Earth science research. The contract supports NASA's planned operation of two Global Hawk aircraft, their associated ground control station, and related systems. Northrop Grumman's technical assistance will include analysis, design support for unique systems, simulations, software development and engineering, and operational and manufacturing support. The indefinite-delivery, indefinite-quantity sole-source contract has a value of up to $25 million. Under a Space Act Agreement signed in April 2008, NASA and Northrop Grumman are bringing to flight two pre-production Global Hawk air vehicles for NASA research activities. NASA will use the autonomously operated unmanned aircraft for missions supporting its Science Mission Directorate and the Earth science community that require high-altitude, long-endurance, long-distance airborne capability.