The launch will end a 64-year run for the Delta rocket fleet, which was designed to lift large payloads into space. The Delta IV Heavy rocket, which is the 16th of its kind to launch since 2004, will carry a secret cargo as it lifts off one last time from Space Launch Complex-37 at Cape Canaveral Space Force Station in Florida. All we know about the current mission is its name, NROL-70, and when it is scheduled to lift off.