VANDENBERG AIR FORCE BASE, Calif. --In Space Launch Complex 576-E, Vandenberg Air Force Base in California, Stages 1 and 2 of the Taurus XL launch vehicle are being integrated for NASA's Orbiting Carbon Observatory, called OCO. OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB KSC-2009-1550