A SpaceX Falcon 9 launch vehicle launched the Surface Water and Ocean Topography (SWOT) mission from Space Launch Complex 4E (SLC-4E) at Vandenberg Space Force Base, California, on 16 December 2022, at 11:46 UTC (03:46 PST). Following stage separation, Falcon 9’s first stage (B1071) landed on Landing Zone 4 (LZ-4) at Vandenberg Space Force Base, having previously supported five missions: NROL-87, NROL-85, SARah-1 and two Starlink missions. SWOT was jointly developed by NASA and Centre National D'Etudes Spatiales (CNES) with contributions from the Canadian Space Agency (CSA) and United Kingdom Space Agency. SWOT will survey nearly all water on Earth’s surface for the first time, measuring the height of the world’s oceans, rivers, and lakes, helping scientists track how fresh and saltwater bodies change over time.