It's an interesting tidbit, but doesn't answer the primary question I had: For all the pomp and ceremony government agencies usually go for, why Snoopy of all possible medal shapes?
After the completion of the Mercury and Gemini projects, NASA wanted a way to promote greater awareness among its employees and contractors of the impact they had on flight safety, the flight crews and their missions.[4] NASA wanted to use a symbol for spaceflight that would be well known and accepted by the public, similar to the recognition received by the United States Forest Service's Smokey Bear.
The idea for the Silver Snoopy award came from Al Chop, who was director of the public affairs office for the Manned Spacecraft Center (now called the Lyndon B. Johnson Space Center). He wanted to create an award featuring Snoopy as an astronaut to be given by astronauts in recognition of outstanding contributions by employees.[5]
Charles M. Schulz, who was an avid supporter of the U.S. space program, welcomed the idea of using Snoopy for the award. Schulz and United Feature Syndicate (the distributor of the Peanuts comic strip) agreed to let NASA use "Snoopy the Astronaut" at no cost.[4] Schulz himself drew the image the award pin was based on. He also drew promotional art for posters to promote the award program.[5]
Trivia: The fabric cap worn by NASA astronauts as part of the Extravehicular Mobility Unit is known as a "Snoopy cap", a reference to how the white crown and brown earflaps of the cap resemble Snoopy's fur and ears.
A reporter for the Houston Chronicle claimed to have Chop's Snoopy fandom straight from the source . . .
Considering Charles Schulz's retirement, this is an ideal time to get Al Chop to tell how he drafted Snoopy for a special NASA assignment.
...
Chop said he was, at the time, director of the public affairs office for the Manned Spacecraft Center in Houston. And, like an estimated 355 million other people in 75 countries, he was a fan and avid reader of Schulz's Peanuts comic strip. He especially liked the dog who often assumed a pilot's role atop the doghouse.
"Snoopy was a flier," Chop said. "No reason he couldn't become an astronaut, too."
Another question in my head is whether they had to license Snoopy from the estate of Schulz (or whoever holds the rights the Peanuts gang).
ETA that unsnap_biceps just answered my questions.
Though I don't think I will be able to cite an official document stating Al Chop is a Snoopy fan :-), so there's that.
by Thom Marshall, Houston Chronicle, January 7, 2000
[1] https://www.chrono24.com/omega/omega-speedmaster-silver-snoo...