[dralley]

>the F4 being retrofitted with a cannon in a centerline pod

The Air Force and Navy had different solutions to the early trouble with the performance of the F4. The Air Force attached a cannon in a centerline pod, the Navy did not, and invested in more training and the development of new tactics (notably the Top Gun program).

The Air Force's gun pod did improve kill ratios a little bit, but the Navy's training programs improved kill ratios by a lot, using the same fighters and the same missiles as before. The Air Force later copied the Navy's training programs. I'm sure improvements were made to the missiles over the course of the war as well.

So even at the time (in the earliest days of missile technology) it's not clear that BVR focus was the wrong decision, only that you can't expect pilots to automatically understand how to fight in a new paradigm. But today it's 50 years later, almost as big a gap as between Vietnam and the Wright brothers - BVR combat is very well understood and missile technology is vastly better.