Image: Boeing X-37B inside payload fairing before launch
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The X-37B Orbital Test Vehicle in the encapsulation cell at the Astrotech facility April 13, 2010, in Titusville, Florida. Air Force officials are scheduled to launch the X-37B April 21, 2010, at Cape Canaveral Air Station, Florida. The X-37B is the U.S.'s newest and most advanced unmanned re-entry spacecraft.