It’s weird how people bring this up. It was very unusual for the usps not to have to set aside money now to pay for pensions in the future.
Also the 2022 Postal Service Reform Act eliminated the prefunding and ~$57 billion of overdue payments, but USPS finances were still dogshit afterwards: USPS revenue was $80 billion and expenses were $89 billion in FY2024
The (non-navy) military has no constitutional mandate at all, it’s an industrial scale cash incineration device which the postal service can’t hold a candle to, and we don’t blink at it wasting 10x or more of the postal service’s opex.