 In September 2015, pad modifications began to support human spaceflight with the Boeing CST-100 Starliner.· Modifications include the addition of a launch service tower to provide access to the capsule for "pre-launch processing, crew access, and safety egress systems should the need to evacuate Starliner on the pad occur".In addition to satellites, Titan vehicles launched several probes from LC-41 in the 1970s, including the Helios probes to study the Sun, the Viking probes to Mars, and the Voyager planetary flyby and deep-space probes.More recent probes have also been launched from LC-41 using the Atlas V