You must begin your PTDY the day after you final out process the unit and base you are assigned to. You must take the PTDY in all one chunk, and IF you are taking terminal leave, it must begin the day after your PTDY ends. So for example; I applied for 20 days PTDY beginning 31 Aug and ending 19 Aug, then applied on a separate 988 for 4 days Terminal Leave starting 21 Aug, ending 23 Aug. Although I will have out processed base/squadron as of 30 Jul--I will not be officially retired (i.e. separated) from the military until 24 Aug ...
What this means for you is that yes you can choose your separation date (somewhat), provided AFPC approves and it does not exceed the 90 day cutoff, AND your requested day does not fall in the middle of a month. If you are being medically separated, you will NOT separate any later than 90 days from day of signing for (concurring with) IPEB/FPEB package. AFPC WILL NOT extend your date of separation to allow you to use up all your leave/PTDY benefits. SO, if your separation date is Oct 30...and you are taking 30 days PTDY PLUS terminal leave then your final day at your unit/base would be 30 days PTDY + XX days terminal leave...if you wanted 30 days terminal leave, you would start PTDY 1 September, and go through 30 September, then your Terminal leave would kick in 1 October and end 30 October (which if it is your approved separation date would be your final day in the military. This means you would have to complete your final outprocessing of your unit/base on 31 August. (All PTDY/Terminal leave requests must be submitted in paper to the commander, he approves or not as he sees fit, then the forms go to finance to be given leave routing numbers and will be fully approved once finance has signed off on both.) If you have more days of leave than you can use in conjunction with your PTDY, then you either take full Terminal Leave OR (and in my opinion this makes more sense as your time is limited for med separation/retirement) Take your PTDY, take as much terminal leave as you can, and sell back any left over leave. That way you get an extra chunk of change on separation, AND you still draw BAH/BAS while on Terminal leave/PTDY.