E5 pay while at ocs. You will notice your bank account growing at ocs and think you are making tons of money becuase you dont spend any. Then you will get your uniform bill a week before you graduate and crap you pants when you see how much it is. In all I spent over 3.5K while at ocs (not just on uniform stuff).
That seems like a lot. I didn't spend near that amount and I have a wife.