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Space exploration is an expensive endeavor for the U.S. government. In recent years, NASA's budget has been cut more frequently than it has been maintained or increased. The agency underwent a restructuring and streamlining program that included a goal of reducing its civil-servant staff. In 2004 the trend reversed when President George W. Bush called for a new initiative to further space travel and exploration, and as a result NASA projected a $1 billion budget increase over the span of five years. This was expected to positively affect the NASA workforce. This changed in 2011 with the discontinuation of the aging shuttle program.