When Neil Armstrong stepped off the footpad of the Lunar Module "Eagle", he said; "That's one small step for a man - one giant leap for mankind."
He was contrasting the action of one person - himself - with what had effectively been achieved by the whole of humanity.
There is some doubt as to whether he actually said "a man" or "man", but the meaning behind the statement is clear.
"That's..." The full speech was "That's one small step for [a] man, one giant leap for mankind"
Neil Armstrong
His first step on the moon was That's one small step for man , one giant leap for mankind.
Correct
Buzz Aldrin
Buzz Aldrin
During the Apollo 11 mission, Neil Armstrong took the first step onto Moon's surface on July 21 1969 at 02:56 UTC.
Richard Nixon
Buzz Aldrin .
Neil Armstrong kept the first step then it is sure that he took the second step also. JOKE
"That's one small step for [a] man, one giant leap for mankind"
Buzz Aldrian