As for PRK vs Lasik, afaik PRK is not nearly as good as lasik and in fact lasik is PRK without the loss of tissue. In PRK your eye loses it's protective layer (the epithelium) forever whereas with lasik they open the protective cap and then close it... Weird that the USAF accepts PRK and not lasik. And on our side of the fence it's just one more reason to wash out people who could do the job and not be a liability.

As a lasiked person, the official reason I was given by the military is that my eyes could explode should a suden decompression occur. After checking with a few ophtalmologists, it's apparently absolute nonsense. The military doctors assume that a lasiked eye is as weak as an RK'ed eye (the very old surgical procedure where one's eyes where slit radially using hands and scalpels, leaving huge scars - today's procedure is a few million times more accurate and way, way less intrusive).
Here's an RK'd eye:
Ain't it purrty?
