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Michael Freilich, director of NASA’s Earth Science Division, NASA Headquarters, signs a star on the United Launch Alliance Delta II with the NASA Ice, Cloud and land Elevation Satellite-2 (ICESat-2) onboard, Thursday, Sept. 13, 2018, at Vandenberg Air Force Base in California. This will be the final launch of a Delta II rocket. The “381” on the rocket signifies that this is the 381st flight in the Delta family. The first Delta I was launched in May 1960. A star traditionally was placed on the rocket to recognize each mission. For the final Delta II, stars were sent to team members and partners throughout the nation. This rocket boasts more than 150 stars with over 800 signatures of people who have been part of the Delta II program. The ICESat-2 mission will measure the changing height of Earth's ice.