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    The first of 15 Block 40 Global Hawk unmanned aircraft reconnaissance system is unveiled by Northrop Grumman and U.S. Air Force officials June 25, 2011 in Palmdale, Calif. This newest addition to the Air Force's growing fleet of Global Hawks carries an advanced, all-weather multi-platform radar technology insertion program (MP-RTIP) sensor capable of detecting, tracking and identifying stationary and moving targets. (Courtesy photo)

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