Global Hawk (Drone aircraft)

found: Work cat.: Leonard, Robert S. Innovative development: Global Hawk and Darkstar, 2002.

found: WWW.af.mil/factsheets, viewed June 7, 2006(RQ-4 Global Hawk; Global Hawk)

found: Wikipedia, March 4, 2008(RQ-4 Global Hawk is an unmanned aerial vehicle (UAV) used by the US Air Force as a surveillance aircraft. "R" is the Dept. of Defense deisgnation for reconnaissance; "Q" means unmanned aircraft system. The "4" refers to it being the fourth of a series of purpose-built unmanned aircraft systems. Global Hawk)