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The sign near the trainer. It read:

Gemini Trainer

Gemini astronauts rehearsed their flights in trainers like this one. Sixteen astronauts used two-man Gemini spacecraft to pioneer rendezvous and docking, spacewalks, and long-duration flight—all requirements for Apollo Moon flights. They were:

Gus Grissom, John Young Gemini 3, March 23, 1965	Neil Armstrong, David Scott Gemini 8, March 16, 1966
Jim McDivitt, Ed White Gemini 4, June 3-7, 1965	Tom Stafford, Gene Cernan Gemini 9, June 3-6, 1966
Gordon Cooper, Pete Conrad Gemini 5, August 21-29, 1965	John Young, Michael Collins Gemini 10, July 18-21, 1966
Jim Lovell, Frank Borman Gemini 7, December 4-18, 1965	Pete Conrad, Dick Gordon Gemini 11 September 12-15, 1966
Wally Schirra, Tom Stafford Gemini 6, December 15-16, 1965	Jim Lovell, Buzz Aldrin Gemini 12 November 11-15, 1966

Gemini 3 was first to change orbits, essential for rendezvous and docking. On Gemini 4, Ed White became America's first spacewalker, and Gemini 7 orbited for 14 days, proving that astronauts could withstand weightlessness long enough to reach the Moon and return. Gemini 8 was first to dock with another spacecraft.