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Apollo 10 (May 18–26, 1969) was the fourth human spaceflight in the United States' Apollo program and the second to orbit the Moon. NASA, the mission's operator, described it as a "dress rehearsal" for the first Moon landing.
Snoopy, Charlie Brown's dog, was chosen for the call sign of the Lunar Module since it was to "snoop" around the landing site, with Charlie Brown given to the command module as Snoopy's companion