The last United Launch Alliance Delta II rocket joins the lineup of historic launch vehicles in the Rocket Garden during a ribbon-cutting ceremony at the Kennedy Space Center Visitor Complex in Florida, on March 23, 2021. From left, are Brigadier General Stephen Purdy Jr., 45th Space Wing commander and Eastern Range director, Patrick Space Force Base and Cape Canaveral Air Force Station; Ron Fortson, director and general manager, Launch Operations, United Launch Alliance; Kennedy Space Center Director Bob Cabana; Tim Dunn, launch director, Launch Services Program; and Therrin Protze, chief operating officer, Delaware North/KSCVC. The Delta II rocket was a workhorse for NASA and civilian scientists, the U.S. military, and commercial clients throughout its almost 30 years of service. Since its first launch in 1989, the Delta II has launched 154 successful missions. NASA’s Launch Services Program launched the ICESat-2 spacecraft on the final Delta II launch for the agency on Sept. 15, 2018, from Vandenberg Air Force Base in California.