I was BDCP for a little over a yr, Sept '02 - Nov '03, and I made my '02, '03 and '04 Roth IRA contributions with the money. I highly recommend that all ppl lucky enough to get BDCP take a look around at the financial status of all those baby boomers that can't afford to retire due to poor financial planning. Basically the Gov't is giving you a great gift, don't go blow it all. Try and save at least some of your money for later in life when you may actually need it.
Also don't forget that you will probably spend about $2500-$3000 at OCS just on uniforms, class treasury, hi mom's, tee shirts, etc., and you will get a pay cut when you go to OCS because you won't get BAH anymore, and they will deduct most of your BAS money to pay for the chow hall.
Peace, love, and poopies.