Here's the breakdown of astronauts who walked on the moon during each Apollo mission:

* Apollo 11 (July 20, 1969): Neil Armstrong and Buzz Aldrin

* Apollo 12 (November 19, 1969): Pete Conrad and Alan Bean

* Apollo 14 (February 5, 1971): Alan Shepard and Edgar Mitchell

* Apollo 15 (July 30, 1971): David Scott and James Irwin

* Apollo 16 (April 21, 1972): John Young and Charles Duke

* Apollo 17 (December 11, 1972): Gene Cernan and Harrison Schmitt

So, two astronauts walked on the moon during each Apollo landing.