Also...no guarantees you can make it to 55 in an ejection seat aircraft. Getting old is a bear, and I know more than a few of us guys who thought we were bullet proof who went extended DNIF for various ailments. For me...I quit F15s after 20 when facing back surgery #2. Got a bunch of bros who've suffered other ailments as well. Getting to 40-45 without a major health event is a reasonable goal. Staying fit to fight until 55ish...well...might be a bit tougher with the law of averages.