Good PRK candidate? Possible LASIK/LASEK candidate? What is the new epiLASEK? Navy

My glasses prescription is -6.75 and -6.50, contacts is -5.75 and -5.50. Years before joining I've been looking at PRK, etc. so I can do the job I want in the Navy and now that I'm in my poor vision is the single obstacle. Im 20 y/o and have stable vision and they have approved me to be a good candidate but I have not had a Pachymetry done. I'm praying my Corneas are thick enough. Are thin corneas rare? How many microns will I need with room for touch ups? Please help

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