From 1948 to 1949, Stapp headed research project MX981 at Muroc Army Air Field (later renamed Edwards Air Force Base) for the purpose of testing the human tolerance for g-forces during rapid deceleration.
Fra 1948 til 1949 foregik der et projekt benævnt MX981 på Muroc Field (senere Edwards Air Force Base) med det formål at teste menneskets tolerance over for g-kræfter under kraftig deceleration.