https://www.cnet.com/news/spacex-launches-nasa-iridium-satellites-into-orbit-aboard-falcon-9/ > SpaceX is getting a lot of mileage out of its used rockets. The company successfully launched a used Falcon 9 on Tuesday from Vandenberg Air Force Base's Space Launch Complex in California. > The Iridium-6/GRACE-FO mission is all about satellites. Lots of them. The payload includes two NASA GRACE-FO satellites. GRACE stands for "Gravity Recovery and Climate Experiment." The FO stands for "Follow-On" since the satellites are part of a continuing mission to monitor Earth's water cycle. SpaceX successfully deployed the NASA satellites as expected.