reassigned him to NASA headquarters in Washington, D.C. Shea felt that his new post was a "non-job," and left after only two months. Program recovery Gene Kranz called a meeting of his staff in Mission Control three days after the accident, delivering a speech which has subsequently become one of NASA's principles. Speaking of the errors and overall attitude surrounding the Apollo program before the accident, he said: "We were too 'gung-ho' about the schedule and we blocked out all of the problems we saw each day in our work. Every element of the program was in trouble and so were we." He reminded the team of the perils and mercilessness of their endeavor, and stated the new requirement that every member of every team in mission control be "tough and competent", requiring nothing less than perfection throughout NASA's programs. In 2003, following the Space Shuttle Columbia disaster, NASA administrator Sean O'Keefe quoted Kranz's speech, applying it to the Columbia crew. Command module redesign After the fire, the Apollo program was grounded for review and redesign. The command module was found to be extremely hazardous and, in some instances, carelessly assembled (for example, a misplaced wrench socket was found in the cabin). It was decided that remaining Block I spacecraft would be used only for uncrewed Saturn V test flights. All crewed missions would use the Block II spacecraft, to which many command module design changes were made: The cabin atmosphere at launch was adjusted to 60% oxygen and 40% nitrogen at sea-level pressure: . During ascent the cabin rapidly vented down to , releasing approximately 2/3 of the gas originally present at launch. The vent then closed and the environmental control system maintained a nominal cabin pressure of as the spacecraft continued into vacuum. The cabin was then very slowly purged (vented to space and simultaneously replaced with 100% oxygen), so the nitrogen concentration gradually fell off to zero over the next day. Although the new cabin launch atmosphere was significantly safer than 100% oxygen, it still contained almost three times the amount of oxygen present in ordinary sea level air (20.9% oxygen). This was necessary to ensure a sufficient partial pressure of oxygen when the astronauts removed their helmets after reaching orbit. (60% of five psi is three psi, compared to 60% of which is at launch, and 20.9% of which is in sea-level air.) The environment within