NASA's commercial crew transportation live announcement
nasa.gov
nasa.gov
The contract specifies between 2 and maximum of 6 missions (each), and includes the certification process. Each contract has the same requirements.
Really? This is pretty sad. Going to low-Earth orbit is neither a "seminal moment" for NASA nor a "major achievement" for America.
This isn't like Virgin Galactic and SpaceShipTwo, with a private company offering spaceflight to civilians.