Main Engine Cut Off

ULA posted a new video about the Advanced Cryogenic Evolved Stage over on YouTube. They spend a lot of time talking about on-orbit refueling, distributed lift, and Integrated Vehicle Fluids. The video even shows a little sneak peek of Xeus, the Masten-ULA lunar lander collaboration.

ULA talks a lot about ACES being capable of a lot of extra tasks once in orbit—and they classify that as reusability—but I’m not sure how exactly they’re going to pull all of that off. Maybe there will be versions of ACES optimized for on-orbit servicing that are flown on lower-energy, lower-payload missions?