Boeing's X-45A unmanned aerial vehicle (UAV) began testing its fourth and final software upgrade with its 51st flight at NASA's Dryden Flight Research Center earlier this month, paving the way for a final "graduation demonstration" expected in August. The two X-45A prototypes and their T-33 surrogate aircraft are expected to fly 10-15 missions total as part of this last block of testing, including the graduation demo ñ a multi-aircraft simulation of a suppression of enemy air defenses ...


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