Base of the SLC-2 launch pad is embossed with well wishes for the final launch of the United Launch Alliance Delta II rocket, Thursday, Sept. 13, 2018, at Vandenberg Air Force Base in California. ULA launched NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2) on Saturday, Sept. 15, 2018. The ICESat-2 mission will measure the changing height of Earth's ice. Photo Credit: (NASA/Bill Ingalls)