the S-IVB still attached, as would be required for the burn that would take lunar missions to the Moon. Then, after separation from the S-IVB, Schirra turned the CSM around and approached a docking target painted on the S-IVB, simulating the docking maneuver with the lunar module on Moon-bound missions prior to extracting the combined craft. After station keeping with the S-IVB for 20 minutes, Schirra let it drift away, putting between the CSM and it in preparation for the following day's rendezvous attempt. The astronauts also enjoyed a hot lunch, the first hot meal prepared on an American spacecraft. Schirra had brought instant coffee along over the opposition of NASA doctors, who argued it added nothing nutritionally. Five hours after launch, he reported having, and enjoying, his first plastic bag full of coffee. The purpose of the rendezvous was to demonstrate the CSM's ability to match orbits with and rescue a LM after an aborted lunar landing attempt, or following liftoff from the lunar surface. This was to occur on the second day; but by the end of the first, Schirra had reported he had a cold, and, despite Slayton coming on the loop to argue in favor, declined Mission Control's request that the crew power up and test the onboard television camera prior to the rendezvous, citing the cold, that the crew had not eaten, and that there was already a very full schedule. The rendezvous was complicated by the fact that the Apollo7 spacecraft lacked a rendezvous radar, something the Moon-bound missions would have. The SPS, the engine that would be needed to send later Apollo CSMs into and out of lunar orbit, had been fired only on a test stand. Although the astronauts were confident it would work, they were concerned it might fire in an unexpected manner, necessitating an early end to the mission. The burns would be computed from the ground but the final work in maneuvering up to the S-IVB would require Eisele to use the telescope and sextant to compute the final burns, with Schirra applying the ship's reaction control system (RCS) thrusters. Eisele was startled by the violent jolt caused by activating the SPS. The thrust caused Schirra to yell, "Yabba dabba doo!" in reference to The Flintstones cartoon. Schirra eased the craft close to the S-IVB, which was tumbling out of control, successfully completing the rendezvous. The first television broadcast