Has there ever been a Korean War FPS? The only times I remember fighting in the Korean War was in flight sims.
I would love to see a medieval Battlefield type game set during something like the crusades. Instead of AK-47's and Fighter Jets you'd have Crossbows and Swords and Catapults. Teams of players would form together in a Phalanx formation to defend from enemy archers when besieging a castle. It would be awesome.
Two multiplayer games similar to that have come out recently: War of the Roses
and Chivalry: Medieval Warfare
. You have bows, crossbows, long swords, polearms, etc.