60 Years of Spaceflight Patches
arstechnica.com
arstechnica.com
I was lucky enough to get a lot of access to shuttle crews and missions because my dad worked on the Shuttle program, so I have a lot of Shuttle things in storage. Including my t-shirt from the Endeavor rollout!
Or perhaps the most famous secret hidden in a patch: https://en.wikipedia.org/wiki/STS-38
Admittedly, the secret language has largely been lost. Newer patches are more "looks cool" than a reflection of the mission.
He goes into detail about how patches with aliens indicate the project took place at Area 51, and that lightning bolts represent electronic warfare.
https://primaryinformation.org/product/from-the-archives-of-...
Growing up, I bought an Apollo 9 patch on ebay that I liked. I shortly after got an email from none other then John Bisney who said it was a variety he had never seen before and offered me a small sum for it. As a kid still using dial-up, it was quite the experience at the time!