No one had written an overall history of Rocketdynethe professional historians said there was not enough preserved documentation for them to write a proper history bookso I determined to visit key survivors of the glory days of Rocketdyne to record their memories, add my own insight as a member of the team, and preserve the history of how large liquid propellant rocket engines evolved at Rocketdyne and why the team was so successful, writes author Robert S. Kraemer.