I'm a bit older than you and have been getting VA Benefits (payback) for prostate cancer attributed to my USN service (1964-6😎. If you served on a ship and were within the 12nm zone of VN (btwn 1962 and 1975) your PCa is presumptive to Agent Orange (AO) and you don't have to submit anything but your diagnosis, deck logs from your ship showing your actual location within that zone of VN and that's pretty much it. The actual key to getting "payback" is not overloading the VBA with BS. Get a diagnosis and deck logs if you served in VN and you have an excellent chance of collecting. Plus, it would help you if you submitted a claim using a VSO (Veteran's Service Officer) - but it's not a requirement. As an aside, I know of USN Vets with PCa who have collected "payback" for severe exposure to asbestos during service, but that one is not presumptive and needs additional evidence. Mind you, submitting your evidence alone isn't the only thing(s) you'll need. The VBA will also require you submit to a Compensation and Pension (C&P) examination - that they'll schedule for you - before any award is made. Good luck. Remember nothing is automatic or quick with the VA.