I don't know why they would have stated that figure. The only three possible calculations are 1) the percentage awarder, 2) for those on TDRL, the minimum 50% rating, or 3) the length of service calculation, which is 2.5% times years of service. So, it seems there was some error or confusion regarding that 75% figure. The only other thing I can think of is maybe they meant to convey that the maximum payout possible under the law is 75% times retired base pay. Maybe you should clarify with the PEBLO.