"Delta IV Heavy rocket successfully launches classified spy satellite"
United Launch Alliance successfully launched its first mission of the year, the penultimate liftoff of its Delta IV Heavy rocket, carrying a classified payload for the National Reconnaissance Office. The Delta IV Heavy is the last of the Delta family of rockets, with only one more launch scheduled for 2024. The rocket has been used for national security missions and notable NASA missions, including launching the Parker Solar Probe and the first flight of the Orion spacecraft. ULA's future launches will mostly come from the Vulcan Centaur rocket, with dozens of launches in the manifest.