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VANDENBERG AIR FORCE BASE, Calif. -- The first stage of the United Launch Alliance Delta II rocket that will carry the Aquarius/SAC-D spacecraft into low Earth orbit is being prepared for its vertical lift into the service tower at NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in California. Following final tests, the spacecraft will be integrated to the Delta II in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, on its three-year mission, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes. Photo credit: NASA/VAFB