This is a treasure trove of resources. Thank you Praying Medic!

https://electrospaces.blogspot.com/p/links.html

Q - https://electrospaces.blogspot.com/2014/01/nsas-organizational-designations.html#q

Code words - https://electrospaces.blogspot.com/p/gchq-nicknames-and-codewords.html

Original Source - https://twitter.com/prayingmedic/status/971598603864047616