I won't specifically go into my own experience, I had PRK done nearly 3 years ago while on active duty. I echo what most have said, do your homework. You wouldn't be the first or last dude to spend the cash on LASIK/PRK only to find out you were never qualified based on your pre-existing condition. Check out the individual waiver guides not only for LASIK/PRK but also pre-existing diopter numbers. As for the decision for which procedure to have done. PRK by far and away has the best long term results and less long term side effects there is no disputing that fact the numbers don't lie. Yes there is a significant amount of healing time and pain with PRK that you don't need to endure with LASIK and 90 days of no flying in the Navy/Marine Corps but in the end it's worth it. I'll take a week or two of a 'sand feeling' in my eye so I can see when I'm 50 and be able to drive at night. Here's a link to the Navy's waiver guide. I know the Navy is conducting studies with LASIK right now for aviators at Balboa Naval Hospital and the guide changes as those studies are complete.

http://navmedmpte.med.navy.mil/nomi/...y%20080624.pdf