NASA Photo ID: S65-20593, 65-H-431
Date Taken: 03/22/65
Riding the elevator to the white room atop the Gemini Launch Vehicle on Pad 19 are Astronauts Alan B. Shepard Jr. (left) and John W. Young. The Gemini-Titan 3 flight was scheduled on March 23, 1965. Young is the pilot of the GT-3 mission. Shepard was the Mercury Redstone 3 pilot.
Source: NASA photo in my possession