NASA will make a major announcement today at 4 p.m. EDT regarding the return of human spaceflight launches to the United States. Whoever is chosen will have the goal to achieve certification of the system – including a test flight to the International Space Station with a NASA astronaut — in 2017, returning a critical capability to America and greatly expanding the scientific research potential of the orbiting laboratory. Watch the announcement live on NASA TV at www.nasa.gov/ntv and find out details throughout the day on the Commercial Crew Program blog.