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One of the awards presented to Gus Grissom.

It reads (the Greek is approximate)

ΠΡΟς ΤΙΜΗΝ ΟΡΝΙθΩΝ ΣΠΑΝΙΩΝ

Virgil I. Grissom
Member
Board of Advisors
The Air Museum

At the time, the Planes of Fame Air Museum was known simply as "The Air Museum," so it seems that this may have been issued by them, although an email inquiry into this issue resulted in a "before my time" reply.