The Vulcan launch system is a replacement under development by ULA to replace the Atlas-5 and Delta-4 families.
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
Sierra Nevada Corporation (SNC) says the first flight of its Dream Chaser spacecraft to the ISS is now planned for 2022 because of development delays.
ULA said the delay in Dream Chaser’s first mission will not prevent Vulcan from getting certified on time for its first national security mission in 2022.