First off your never to old to apply. Don't regret it, being too old is only a state of mind. If you decide not to pursue a Commission, then don't but at least stay in and try to make it to E-7. If you can get a full military pension out of it then make sure you can get that accomplished. Pensions are hard to come by, but once you get it, thrive in knowing that it's yours to keep forever...
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Sick and tired of being Sick and tired.