I've had PRK...
The Navy did my PRK. But then again, I was already a winged aviator. From what I understand, you can get PRK done in order to qualify for the flight program. Either way, you can still get a flight slot if your vision is correctable to 20/20 with glasses/contacts. For the Navy (and this may have changed since '97 when I came in), pilot candidates could not have uncorrected vision worse than 20/50. The Navy has been sending Naval Academy Midshipment to get PRK in order to qualify them for the flight program. I know the Air Force's standards used to be less stringent. You still had to correct to 20/20, but your uncorrected could be up to 20/200. Once again, all of this may have changed so you have to do some more research to get up to date info.