NASA Photo ID: S69-34485, 69-H-803
Date Taken: 05/18/69
Astronaut John W. Young, Apollo 10 command module pilot, adjusts strap on his communications cap during suiting up operations for the lunar orbit mission. Minutes later Astronauts Young; Thomas P. Stafford, commander; and Eugene A. Cernan, lunar module pilot, rode a transfer van from the Kennedy Space Center's Manned Spacecraft Operations Building over to Pad B, Launch Complex 39, where their spacecraft awaited them. Liftoff was at 12:49p.m. (EDT), May 18, 1969.
Source: NASA photo in my possession