I'm watching Danny Glover's "Flight of the Intruder" on Netflix.
I'm able to figure out most of the slang and acronyms, but I can't figure out these 2:
In the case of #1, it's apparently some sort of officer or job (navigator?). In the case of #2 it's a type of airplane, and I can only judge that I do not believe it means B-52.
Example: "I heard you were my new B.N. sir"
Example: "I'm not even rated on the B's!"