I like the list so far. Not much to add at the moment, although I'll try to contribute a couple of ideas later.
One idea, however, would be to cover wars / conflicts involving aircraft, after WW2 up to the present day, with Korea and Viet Nam being obvious choices, but with many, many possibilities, from "bush wars" to all out conflict.
This would be open to any type of aircraft that had been involved in the chosen event, and would include jets, props and (dare I say it) rotary wing, combat, transport, recce etc etc.