But anyway, it's an incredible machine, and we'll never design anything like it maybe ever again. Certainly not anytime soon. So despite its technological incredibleness, for lack of a better word, it had a couple key limitations. One was, it's not that safe. So we lost two of them, challenger and Columbia. And we could talk about that. I knew the guys in Colombia, and that was really, really rough. And then the second thing was, it's super expensive because it took so much maintenance, even though it was reusable, or most of it was. It took so much maintenance, it took a standing army to keep it running. We were spending, I think, three or $4 billion a year on the program, and there's no way, if we wanted to build something that was going to be more cost effective or safer, there's no way we're going to get a plus up from Congress of, like, an additional $4 billion a year to go do that. The only way, really, to make it happen was to stop flying the shuttle. So we took a very painful decision. And we said, okay, we're going to retire these things so we can make something new. And we know that there's going to be a gap period where we're not going to have anything and it's going to suck. But the good news is the great timing about this conversation right now is that gap ends this year.