In the event that veterans or their eligible persons sponsored as students under Chapters 30, 32, 35 and Title 38 and Chapter 1606 or Title 10 U.S. Code, fail to enter the program or withdraw or are discontinued there from at any time prior to completion, the amount charged for tuition, fees, and other charges shall not exceed the approximate pro rata portion of the total charges for tuition, fees, and other charges that the length of the non-accredited program bears to its total length. A registration fee of $10.00 need not be refundable at any amount beyond that is subject to proration and refund (CFR 21.4254(c) (13). The prorated portion may not vary more than 10% of the total costs for tuition, fees, and other charges.