Yeah I actually just jumped in to spoiler my post once I posted it, beat me to it, thx. EDIT: Solved it! That was a fun one. A neat new technique you guys are using! I like it ;P
Came across this one (https://en.wikipedia.org/wiki/Six-bit_character_code) , but still not really sure where to go with the letters - I'm pretty sure im overthinking this (or completly looking at the wrong places) Even birds have 4 to 6 letter standard codes! http://www.birdpop.org/docs/misc/Alpha_codes_eng.pdf
You're going down the rabbit hole a bit too far there. Spoiler You need to find somewhere to put the code. Where, I can't say
If you haven't completed this yet, it's worth seeing it through! Spoiler: HINT If you've completed your training missions, you may want to apply what you've learned here.