What are some tips on trying to prove service connection for pes cavus?

My entrance exam notated moderate pes cavus. For some reason my exit exam didn't note it at all. I do have several records of foot trauma in service and I was a paratrooper which I'm sure didn't help.

Since pes cavus is a congenital condition, it would be pre-existing. You would have to show that trauma made the pes cavus worse which is very difficult to do by the very nature of the condition.

If you had significant foot trauma and have residual effects of that (range of motion, pain, disfigurement, scarring, etc.), then you are better off applying for that on its own instead of trying to tie to the high arches. To be a successful claim you need to have an incident, accident, or exposure in service; you need to have any existing diagnosis; and you have to have a medical nexus connecting the two.

If it doesn't appear the first time on your service rating resubmit it or appeal. The compensation is for aggrevation of prior injuries also. Don't give up.