Pub. L. 100-685, tit. III, sec. 304

Sec. 304. The Administrator should develop a plan to improve the manned and unmanned space transportation system including— (1) the continued enhancement of the space shuttle and its ground system in order to increase safety and efficiency and reduce costs; (2) the completion of the development of a heavy-lift expendable launch vehicle if consistent with mission requirements of the Administration, the Department of Defense, and other Federal agencies; and 102 STAT. 4097 (3) the initiation of preliminary design activities for the next generation of a manned space launch system beyond the space shuttle.