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A sign near the spacecraft. It reads:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION

Mercury Spacecraft
Sigma 7

6 ORBIT FLIGHT ON 3 OCTOBER 1962

Astronaut Walter M. Schirra, Jr.

3^RD UNITED STATES MANNED ORBITAL SPACE FLIGHT

Designed and Manufactured for NASA
by
McDONNELL, ST. LOUIS MISSOURI U.S.A.

A similar sign accompanies Gemini 8 at Neil Armstrong Air & Space. It seems to me I've seen similar signs by other spacecraft as well, although perhaps in vintage photos.