Military airworthiness and crashworthiness.
Civvy aircraft are designed to a set of standards (egFAR25) that determine levels of crashworthiness. Eg seat loading, head strike etc.
I assume military would be made to another standard, if so does that standard vary if you have an ejection seat or not? Eg. If no MB ejector seat, you have to have say 16G, but if you do, equivalent level of safety says it only needs to be say 4G?