Foreword by Dr. Roger D. Launius, Former NASA Chief Historian For the past 75 years, the U.S. government has invested significant time and money into advanced a

Trace the historical beginnings of the aircraft that pushed aviation-performance levels to new heights, many of which were developed into the great operational

The revolutionary X-15 remains the fastest manned aircraft ever to fly. Built in the two decades following World War II, it was the most successful of the high-