The oldest space shuttle is heading to DC after its last mission STS-133. It carried the Hubble Space Telescope, the German Ulysses probe to Jupiter and twice headed to the Mir station. Initially, it carried mainly communication satellites, then scientific equipment, and at the end of its service mainly parts of the ISS. And it was Discovery that was almost destroyed by the decision to launch from Vandenberg Air Force Base to launch spy satellites into polar orbit.