"A'"school wives and girlfriends

They are at school and we are stuck at home!
Ouestions, concerns, or anything else you would
like to talk about!

How to address a letter to a Navy Sailor in A school

This may seem like a silly question but I am unsure how to write a letter to my sailor. He is in A school in Monterey and of course I know his name, I have the address, but I am sure there is a specific format to write his name/title. Does anyone know what that is supposed to look like? What the format is for addressing a package?

Thanks for your time!