Just before sunrise—unnoticed and unannounced except for the whine of its single jet engine—an unmanned reconnaissance aircraft with the most combat hours in the U.S. military's inventory left here on the final leg of its last operational mission. Continuing a trip on Feb. 20 from RAAF Edinburgh that began in the Middle East about a week ago, it headed toward Edwards AFB, Calif., where it may conduct some additional test flights while Northrop Grumman looks for an appropriate museum to house the aircraft.
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