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Here's a new mnemonic diagram to illustrate the year that Man first walked on the moon:

Man's first steps on the moon occurred at 2.56 GMT on 21st July 1969, when Apollo 11 astronaut Neil Armstrong left the Lunar Excursion Module, having landed earlier on the 20th.

Apollo was the name given to the moon rocket programme following the success of the Gemini spaceflight programme. To recall which Apollo flight was the first manned landing, just recall the "double-L" as a number within the name:

APO11O

For the crew of Apollo 11, just recall:

A - B - C
Neil Armstrong, Buzz Aldrin, Michael Collins

The entire series of manned landings was relatively short-lived due to rising costs. After Apollo 11, there were only 6 more manned flights to the moon, one of which (Apollo 13 - an unlucky number!) ended in near-disaster. Thus only 12 men have ever walked on the moon, the third man in each crew having stayed in lunar orbit.