 It's just in my view unfortunate that we made the compromise, after I left NASA, in terms of a partially reusable vehicle, and all that that implies in terms of not only the cost of the throw-away parts but also the cost of the ground troops that have to process it and put it together and fly it every time.That combination—and ground support is a not insignificant part of a Shuttle cost—was a set of decisions that doomed low cost space transportation for that generation of vehicles.