To the Op,
Do not leave your pension for a flying job. Anybody who is an LEO or fire has a great pension(well new hires not so much so but still better than 95% of the public). Don't believe the hype of "you gotta get in now" to a professional flying gig. If your working a fireman 56 sched you have plenty of time to fly part time. Having that extra pension with the medical you're more than likely offered at retirement will help once you start flying full time. Trust me, as someone who left public service, went 121 and now back to public service, your better off where your at until you finish your 20.