24) NASA launched the TETR-A satellite just months before the first lunar mission. The proclaimed purpose was to simulate transmissions coming from the moon so that the Houston ground crews (all those employees sitting behind computer screens at Mission Control) could "rehearse" the first moon landing. In other words, though NASA claimed that the satellite crashed shortly before the first lunar mission (a misinformation lie), its real purpose was to relay voice, fuel consumption, altitude, and telemetry data as if the transmissions were coming from an Apollo spacecraft as it neared the moon. Very few NASA employees knew the truth because they believed that the computer and television data they were receiving was the genuine article. Merely a hundred or so knew what was really going on; not tens of thousands as it might first appear.
The astronauts planned placement of the Early Apollo Scientific Experiment Package (EASEP)  and the . flag by studying their landing site through Eagle 's twin triangular windows, which gave them a 60° field of view. Preparation required longer than the two hours scheduled. Armstrong initially had some difficulties squeezing through the hatch with his Portable Life Support System (PLSS). According to veteran Moon-walker John Young , a redesign of the LM to incorporate a smaller hatch had not been followed by a redesign of the PLSS backpack, so some of the highest heart rates recorded from Apollo astronauts occurred during LM egress and ingress.