PRK could get you into the zone for the guard, but you will need to do a LOT of research. PRK often results in a permanent loss of some of your BCVA (best vision with glasses). If you're 20/20 BCVA now, you might end up 20/22 and screwed for ANY aviation career...
If you can see 20/10 BCVA (with glasses), then you could probably afford to take the hit to 20/12.
My cousin got into USMC air via PRK.