The sign accompanying the communications carrier. It reads
Snoopy Cap - Flown aboard the Apollo 8 Mission by Astronaut
This device held the dual microphones and earphones associated with the Apollo
spacecraft's communication equipment. It was worn under the pressure bubble
helmet. Its shape and coloration gave it some resemblance of the dog "Snoopy"
from the Peanuts comic strip, thus the name "Snoopy cap."