SLS is at $100 million apiece and has no realistic path forward for improving that. Fail-and-iterate was never even an option for them. https://en.wikipedia.or

SLS is at $100 million apiece and has no realistic path forward for improving that. Fail-and-iterate was never even an option for them. https://en.wikipedia.org/wiki/RS-25#Space_Shuttle_program https://en.wikipedia.org/wiki/RS-25#Space_Shuttle_program ("contract extension to manufacture 18 additional RS-25 engines, with associated services, for $1.79 billion")