他们提出了一套方案以替代星座计划，即根据载人飞行目的地的不同而使用不同的火箭。
They presented a series of alternatives to Constellation that would send humans to different destinations and use different rockets.
为此，美国海军提出所谓的“无人舰载空中侦察打击飞行器”计划。
The US Navy’s response has been to propose what it calls the Unmanned Carrier-Launched Airborne Surveillance and Strike aircraft.
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