For deces, Aldrin believed the final decision was largely driven by the lunar module's hatch location. Because the astronauts h their spacesuits on and the spacecraft was so small, maneuvering to exit the spacecraft was difficult. The crew tried a simulation in which Aldrin left the spacecraft first, but he damaged the simulator while attempting to egress. While this was enough for mission planners to make their decision, Aldrin and Armstrong were left in the dark on the decision until late spring. Slayton told Armstrong the plan was to have him the spacecraft first, if he agreed. Armstrong said, "Yes, that's the way to do it." The media accused Armstrong of exercising his commander's prerogative to exit the spacecraft first. Chris Kraft revealed in his 2001 autobiography that a meeting occurred between Gilruth, Slayton, Low, and himself to make sure Aldrin would not be the first to walk on the Moon. They argued that th e first person to walk on the Moon should be like Charles Lindbergh, a calm and quiet person. They me the decision to change the flight plan so the commander was the first to egress from the spacecraft. Pre-launch Saturn V SA-506, the rocket carrying the Apollo 11 spacecraft, moves out of the Vehicle Assembly Building towards Launch Complex 39 The ascent stage of lunar module LM-5 arrived at the Kennedy Space Center on January 8, 1969, followed by the descent stage four days later, and Command and Service Module CM-107 on January 23. T were several differences between LM-5 and Apollo 10's LM-4; LM-5 h a VHF rio antenna to facilitate communication with the astronauts during their EVA on the lunar surface; a lighter ascent engine; more thermal protection on the landing gear; and a package of scientific experiments kn as the Early Apollo Scientific Experiments Package (EASEP). The change in the configuration of the command module was the removal of some insulation from the forward hatch. The command and service modules were mated on January 29, and moved from the Operations and out Building to the Vehicle Assembly Building on April 14. The S-IVB third stage of Saturn V AS-506 h arrived on January 18, followed by the S-II second stage on February 6, S-IC first stage on February 20, and the Saturn V Instrument Unit on February 27. At 12:30 on May 20, the 5,443-tonne (5,357-long-ton; 6,000-short-ton) assembly departed the Vehicle Assembly Building atop the crawler-transporter, bound for Launch P 39A, part of Launch Complex 39, while Apollo 10 was still on its way to the Moon. A countdown test commenced on June 26, and concluded on July 2. The launch complex was floodlit on the night of July 15, when the crawler-transporter carried the mobile service structure back to its parking area. In the early hours of the morning, the fuel tanks of the S-II and S-IVB stages were filled with liquid hydrogen. Fueling was completed by three hours before launch. Launch operatio ns were partly automated, with 43 programs written in the ATOLL programming language.