Inside the mobile service tower is secure inside the United Launch Alliance's Delta II payload fairing.

Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, the Aquarius/SAC-D spacecraft is secure inside the United Launch Alliance’s Delta II payload fairing. Aquarius will be integrated to the Delta II rocket in preparation for the targeted June 9 liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB