IBP - based on pay or pay+allowances?

[Armymutt25A]

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I'm trying to determine if the IBP loan repayment plan is worth it. I have about 10 years left until retirement and am heading off to vet school in Aug. Is the 15% based on your "pay" - base pay, pro-pay, parachute pay - or on pay and allowances - BAS, BAH? I suppose for me, it doesn't really matter - 10 years is 10 years, but it's something useful for planning purposes. There's a bit of a difference between $865/month vs. $1120/month.