I know one to whom it happened "on accident." He has no idea how it happened. If I could figure that out, it'd be great. I know if you go into a fellowship there is an opportunity there somewhere to change to July, but can't recall the details. Good luck. This is another great scam of military medicine-"You owe 4 years" they say, but what they mean is that you owe 4 1/3 years, at least if you want your entire salary that last year.
HPSP FOLKS COMING OUT OF CIVILIAN RESIDENCY!!! If they let you delay your arrival date (they let me pick any day in July) put it off until July 31st. That way the military only owns you for 2 extra months instead of 3. Of course, you have to have something to live off of for 6 weeks between your last residency paycheck and your first military one.....