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VANDENBERG AIR FORCE BASE, Calif. -- Workers on Space Launch Complex 2 at Vandenberg Air Force Base in California prepare to attach a sling crane onto the Delta II second stage. The sling will lift the second stage into the mobile service tower for installation on the first stage for launch of the OSTM/Jason-2 spacecraft. The OSTM, or Ocean Topography Mission, on the Jason-2 satellite is a follow-on to Jason-1. It will take oceanographic studies of sea surface height into an operational mode for continued climate forecasting research and science and industrial applications. This satellite altimetry data will help determine ocean circulation, climate change and sea-level rise. OSTM is a joint effort by the National Oceanic and Atmospheric Administration, NASA, France’s Centre National d’Etudes Spatiales and the European Meteorological Satellite Organisation. OSTM/Jason-2 will be launched on June 20. Photo credit: NASA