launch on need造句

Nonetheless NASA converted STS-335, the final Launch On Need mission, into an operational mission ( STS-135 ) on 20 January 2011.
STS-132 was initially scheduled to be the final flight of " Atlantis ", provided that the STS-335 / STS-135 Launch On Need rescue mission would not be needed.
A significant shift in attitudes toward in-orbit rescues came as a result of the Space Shuttle Columbia disaster, after which NASA took steps to prepare the STS-3xx or " Launch on Need " missions to provide for rescue in certain scenarios.
Space Shuttle missions designated "'STS-3xx "'( officially called "'Launch On Need "'( LON ) missions ) were rescue missions which would have been mounted to rescue the crew of a Space Shuttle if their vehicle was damaged and deemed unable to make a successful reentry.
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