But the commissioners reserved their harshest criticism for the managers of the Marshall Space Flight Center: they found that Larry Mulloy had failed for years to alert his superiors to the seriousness of the failings in the O-rings and that, in his later testimony before the commission, he had misled Rogers and his panel about the extent of the warnings he had provided. They reported that they had found not a single mention of O-ring problems in any of the paperwork—a stack of documents several inches thick—prepared during the flight readiness process of the 51-L mission.
