I've read that the RS-25 level of "reuse" was highly qualified, they required a significant rebuild between flights because they pushed the margins so hard. Wi

I've read that the RS-25 level of "reuse" was highly qualified, they required a significant rebuild between flights because they pushed the margins so hard. Wikipedia says "refurbished" https://en.wikipedia.org/wiki/Space_Shuttle_main_engine https://en.wikipedia.org/wiki/Space_Shuttle_main_engine But you're generally right about the insanity of the Senate Launch System.