The more I read up on WW2 aircraft, tanks, ships and other vehicles, the more I realize what a huge variety of machines there were. And then there are the things they did with them. The British Short Sunderland's and it's activities alone are staggering. There were US aircraft I simply never heard of until I started following "Dark Skies" and some other aircraft channels on You Tube. I haven't even delved into the early jet aircraft! Amazing amount of history in these fields that took place so fast and at such large volumes all at once that it could be a hobby all in itself just keeping track of them. There are great channels devoted to the evolution of military ships, trucks, tanks, weapons...even uniforms. Amazing amounts of history out there.