Northrop Grumman has secured a contract to deliver four unmanned RQ-4B Global Hawk surveillance aircraft to South Korea, as Japan begins negotiating a similar deal. The $657 million "hybrid contract" procures four Block 30 aircraft, two spare engines and two ground control stations, according to a Dec. 16 Defense Department contract announcement. The deal comes almost nine months after South Korea's Defense Acquisition Program Administration announced the selection of Global Hawk to meet its high-altitude surveillance requirement. In a Dec...