What impresses me is the heroism of the guys who flew these planes. Look at the cockpit: there is no electrical automatic anything. Its 1000 levers, 100 gauges, and your training.
Now fly over a Japanese island being straffed by more steel than you care to know about, carring a couple tons of high explosives in your tail, and knowing that if you go down you're done.
Those guys were the greatest.