NASA is faced with a dilemma right now: It wants to fly 19 Space Shuttle missions - 18 to the International Space Station (ISS) and one mission to service the Hubble Space Telescope between now and the end of FY 2010. The problem is that NASA simply does not have the money to do this. As it has been preparing its FY2007 budget NASA identified $5.6 billion in so-called "over-guideline" costs needed to support these missions - at the rate it wanted to fly the missions.