MMMMMMMMMM. No explanation as to why they are not allowed. What would be the responce then if a guy needs eye sight correction long sighted or short sighted. Surely we are doing the same thing correcting a defect........? So the guy who has a heart attack (and I believe military too) go have correction surgery on the heart.......If it proves that it works then why can't we do this. Someone give us an answer, a proper answer not the usual drive Z response without explanation...........
regards ndr1804