Space Shuttle gliding and landing; it was originally intended to be outfitted for orbital operations after the test program, but it was found more economical to upgrade the structural test article STA-099 into orbiter "Challenger" (OV-099). An additional test article, dubbed "Pathfinder" (OV-098), was built for form and fit tests, and is on display at the Alabama Space and Rocket Center in Huntsville, AL. "Challenger" disintegrated 73 seconds after launch in 1986, and "Endeavour" was built as a replacement from structural spare components. Building "Endeavour" cost about US$1.7 billion. "Columbia" broke apart over Texas during re-entry in 2003. A Space Shuttle launch
Space policy of the United States and Ride Report on the future of the national space program. President George H. W. Bush continued to support space development, announcing the bold Space Exploration Initiative, and ordering a 20 percent increase in NASA's budget in a tight budget era. The Bush administration also commissioned another report on the future of NASA, the Advisory Committee on the Future of the United States Space Program, also known as the Augustine Report. During the Clinton administration, Space Shuttle flights continued, and the construction of the International Space Station began. The Clinton administration's National Space Policy (Presidential Decision Directive/NSC-49/NSTC-8) was released on