[NhanH]

Here is the official official story: https://www.nasa.gov/history/sfa-message-everyone-plays-role...

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.

[defrost]

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."

~ No retirement for Snoopy at NASA - https://www.collectspace.com/news/news-021400a.html

by Thom Marshall, Houston Chronicle, January 7, 2000