Starliner-4 is the fourth crewed operational flight of a Starliner spacecraft to the International Space Station as part of NASA's Commercial Crew Program.
The Atlas V N22 is a crew rated variant of the Atlas V 422 - it sports two solid motor strap on boosters with two liquid fueled stages. It will be primarly used to support NASA's Commercial Crew program by taking the CST-100 to orbit.See Atlas Details
United Launch Alliance (ULA) is a joint venture of Lockheed Martin Space Systems and Boeing Defense, Space & Security. ULA was formed in December 2006 by combining the teams at these companies which provide spacecraft launch services to the government of the United States. ULA launches from both coasts of the US. They launch their Atlas V vehicle from LC-41 in Cape Canaveral and LC-3E at Vandeberg. Their Delta IV launches from LC-37 at Cape Canaveral and LC-6 at Vandenberg.INFO WIKI