This is the gate and guard house at Complex 14. Right in front, we see
reserved parking for John Glenn, Scott Carpenter, Wally Schirra, and Gordon
Cooper: the astronauts that flew manned Mercury missions from this Complex. To the right
of these is the parking space for the Complex Launch Director
The sign refers to the "Free World's First ICBM": an Atlas-B missile
launched November 28, 1958 (the first U.S. missile launch to reach full ICBM range of
5,000 nautical miles).
The sign also refers to the "Free World's First Man In Orbit" this was of course
John Glenn on Friendship 7.
Complex 14 also launched Atlas TLVs (Target Launch Vehicles) that carried unmanned Agena
Target Vehicles into orbit to rendezvous with the manned Gemini spacecraft.