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When we went through the process for a FHA, our lender requested for us to have 6 months' worth of payment somewhere like in investments, cash accounts, etc. outside of our down payment money. I don't think that's a rule but I think it was our lender's preference. At the least, I'd call USAA back and ask what that requirement may be.
Well ya, although with VA, I thought you were allowed to roll certain closing costs into the loan? Basically they need to make sure you have enough for down payment, plus closing costs such as title fees, appraisals... etc.