Ares V was actually designed with the RS-68, not the RS-25. That why it was not human rated. > Ares V and SLS designs made economic sense to reuse Shuttle desi

Ares V was actually designed with the RS-68, not the RS-25. That why it was not human rated. > Ares V and SLS designs made economic sense to reuse Shuttle designs and infrastructure Theoretically made economic sense.