Check with Larry Mullen in the DODMERB forum -- he is the official source.
From what we were told at USNA, you must be off any ADD meds for a certain amount of time (6 mos or a year, I think) and be able to function normally in the classroom (no special arrangements such as sitting up front, extra time, etc.) without meds. Of course, you should obviously NEVER discontinue such meds on your own -- you must consult with your healthcare professional.
I have moved this to DODMERB so that Larry can respond to you.