NASA engineer and flight controller best known for his role as guidance officer (or GUIDO) during the Apollo 11 lunar landing: he made the 'Go' call to proceed with landing despite repeated 1201-1202 alarms. Two items: a satin-finish 10 x 8 photo of Bales at his mission control console, signed in black felt tip, "Steve Bales, Apollo 11, GUIDO"; and a first day cover with a cachet honoring man's first lunar landing, signed in black felt tip, "Steve Bales." In overall fine condition.
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