Easy...
...just fail your fitness test/eye test/hearing test/BP test etc etc. They'll kick you out faster than you can say whoah boy and you may even get a medical pension to boot if it can be attributed to military working conditions (hearing etc seeing as there are plenty of letters out there with regard to aircraft operating way above the legal decibel threshold - FACT!)
Can't touch your pension rights then as they terminate. Obviously this is not something I would consider as I want to return the loyalty and integrity shown to me!