Did you get this letter from the Air Force or from the navy. The "Physical Aptitude Test" is basically another word for the CFA (Candidate Fitness Assessment). I suggest you CALL your academy counselor and ask her/him the exact details. Remember: ANYTHING you receive in the mail, you will get an answer that is MUCH MORE ACCURATE, if you simply call your academy admissions counselor, than asking here. Not that we don't know many of the answers; just that they sent you the letter. Therefor, they will know better what they are wanting from you.