The U. S. Commercial Space Transportation Developments and Concepts: Vehicles, Technologies, and Spaceports is an annual publication which highlights the significant developments in commercial space transportation within a given year. This publication focuses on expendable launch vehicles, reusable launch vehicles, U.S. commercial spaceports, reentry vehicles and in-space technologies, propulsion and vehicle component technology, current space prizes and competitions, and new developments in commercial human spaceflight training.