In 2013, the NSBE Space Special Interest Group established the Visions for Human Space Flight Working Group in the wake of repeated cancellations of NASA human spaceflight programs.  The charter of the NSBE Visions for Human Space Flight Working Group is as follows: To provide a high level technical assessment of a human spaceflight strategy that reconciles competing interests and priorities facing the National Aeronautics and Space Administration.

This team of NSBE volunteers has produced a white paper, Unlimited Horizons, that recommends a path forward for the United States.  The white paper is updated periodically and the 2017 edition is now available.  A draft copy of Unlimited Horizons is still available here as a free download.  The final, published copy can be ordered online from Amazon.