Regarding defence quota.. If he is really in defence then he must be knowing it well.. The tickets allotted for defence quota are given through MCOs available on every major stations.. The MCOs only deal with trains passing/originating/terminating there. They have quotas for certain trains only. And not all..
The procdure for booking is - you should visit the MCO with your identity card of defence services and reservation form and ask for the train in which you need the quota. If the quota for the train is available with MCO, then second thing he will check whether the seats are alloted to someone or not. Then he will put a stamp on your form that Defence quota alloted.. Then you...
more... may book the ticket from PRS and again go back to MCO for endorsement of PNR. Then one day prior to departure of train they prepare the chart accordingly and forward it to Booking department. and thus seats alloted in MCO quota are booked.. There are certain facts that they keep waiting for the end is that if your seats are confirmed in general quota/ or you cancel your ticket then you need to inform as they keep one or two persons in waiting too...