美国航宇局计划1988年2月18日恢复航天飞机飞行,并为国防部的有效载荷保留很多发射舱位。航宇局局长詹姆斯·C·弗莱彻透露了航天飞机恢复飞行后38个月内要发射的主要有效载荷。弗莱彻说,拟订的飞行频率是经慎重考虑的、可以接受的。它还反映了里根政府禁止用航天飞机发射大多数商业及国外有效载荷的决定,只能使用航天飞机的有效载荷以及有着国家安全或外交政策 NASA plans to resume its shuttle mission on February 18, 1988, and retain many launch slots for the DoD’s payload. NASA Chief James C. Fletcher revealed the main payload to be launched within 38 months of the space shuttle’s resumption of flight. Fletcher said the proposed frequency of flights was carefully considered and acceptable. It also reflects the decision of the Reagan Administration to prohibit the use of space shuttles to launch most commercial and foreign payloads. It can only use space shuttle payloads as well as national security or foreign policy