Assertion: space shuttle's system | /r/ObjectUse | used solid-fuel motors
Facets:
value: for their escape towers
type: PURPOSE
value: for retro rockets
type: PURPOSE
Source sentences:
text: Not only was this the first launch of the Space Shuttle, but it marked the first time that solid-fuel rockets were used for a NASA crewed launch (although previous systems had used solid-fuel motors for their escape towers or retro rockets).