What you really want is NROL-11 which inadvertently revealed the classified location of the payload: https://gizmodo.com/decoding-hidden-messages-in-those-geeky-...

NRO have most of the best ones but this patch has to be my favourite:

https://en.wikipedia.org/wiki/509th_Operations_Group#/media/...

For anyone interested Trevor Paglen wrote a book about these patches. His talk at CCC is one of my all time favourites. Towards the end he provides the background to some of these patches:

https://media.ccc.de/v/30C3_-_5604_-_en_-_saal_1_-_201312282...

My favorite might be the one with Elvish on it. They're all so varied. Obscure literature references would be a good way of making sure foreign intelligence officers are well-read! :D

My main conclusion from reviewing this list is that there are a lot of furries working at NRO.

The ones in Latin and Irish are some real low-quality translations, but the patches are badass. I love the world-consuming octopus.

You can find a bunch of eBay if you search for 'NRO launch patch'.

NROL 39 is absolutely iconic.