Saturn V engineNASA recalls an actual 1960s F-1 engine – of which clusters of five once launched the mighty Saturn V rockets during the Apollo lunar program – from the Smithsonian for refurbishment and, for the first time in over four decades, re-firing on a test stand at Marshall Space Flight Center in Alabama. NASA engineers examine the properties of the F-1 engine – whose performance still outrates the engines used during the Space Shuttle program – to learn how to improve the J-2X engines planned for use in the first stage of the SLS (Space Launch System) booster that will launch Orion vehicles.