Regarding the transition from being a PJ to medical school or to becoming a PA, are the skills transferable and is the experience attractive to schools?

The experience is absolutely attractive to schools. I am currently in a top 10 school for PAs and I believe that is one of the biggest reasons I was accepted. Schools know you will never quit or fail if you have had that mentality instilled in you from experiences in Special Operations, not to mention the opportunities and experiences I have had as a PJ really set me apart from other candidates.