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美国空军已经批准波音公司生产第 1发改进型一次性使用运载火箭 (EEL V)德尔它 4,并拟用这发火箭于 2 0 0 2年5月发射一颗军用防御航天通信系统 (DSCS)卫星 ,这种卫星近年来一般是用航天飞机或宇宙神火箭发射的。波音公司目前正在研制 5种型号的德尔它 4火箭 ,它们可把 42 10 k
The United States Air Force has approved Boeing to produce the first modified EELV Deltas 4 and is planning to launch a military defensive space communications system (DSCS) in May 2002 using the rocket. Satellites, which in recent years have been launched by space shuttle or space-based rockets. Boeing is currently developing five models of the Deltard 4 rocket that can hold 42 10 k