Everything you ever wanted to know about MGRS in a little over five minutes, and most of it in under one. Give it a watch even if you're not an A-10 pilot, and if you have any questions, feel free to leave a comment!
The NATO phonetic alphabet:
https://upload.wikimedia.org/wikipedia/commons/e/e0/FAA_Phonetic_and_Morse_Chart2.svg
https://en.wikipedia.org/wiki/NATO_phonetic_alphabet