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2004年4月18日，加利福尼亚州，X-45A首次进行GPS制导武器投放测试，X-45是美国国防部先进研究项目局（DARPA）和美国空军联合开发项目，主要用来验证无人作战飞机的技术可行性，以更快、更高效的应付21世纪的全球突发性事件。（The DARPA/U.S. Air Force X-45A Unmanned Combat Air Vehicle (UCAV) system demonstration program completed the first phase of demonstrations, known as Block I, on Feb. 28, 2003.The final Block I activities included two flights at Dryden, during which safe operation of the weapons bay door was verified at 35,000 feet and speeds of Mach 0.75, the maximum planned altitude and speed for the two X-45A demonstrator vehicles.）

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