一、引言为确保未来在太空及网络电磁空间(Cyberspace)的持续主导地位,美国面临的一项最为关键的技术挑战是能够提供全型谱的、成本显著降低的运载能力。目前美国空军的中型和重型运载任务由一次性运载器来承担,如联合发射联盟公司为美国空军提供的宇宙神5和德尔它4火箭。由于近期NASA航天飞机计划的终止,后续相关子合同需要完全由一次性运载器发展计划来履行,导致完成上述发射任务的工 I. INTRODUCTION To ensure the continued dominance of Cyberspace in space and the cyberspace in the future, one of the most critical technological challenges the United States faces is its ability to provide full-spectrum, significantly lower cost of delivery. Currently, the U.S. Air Force’s medium and heavy payloads are carried by one-off vehicles such as Cosmonaut 5 and Delt 4 rocket units jointly launched by the Alliance for the U.S. Air Force. Due to the termination of the recent NASA space shuttle program, subsequent sub-contracts need to be fully fulfilled by a one-off carrier development plan, resulting in the completion of the above launch tasks