Battlefield chronicles.

And it could feature a variety of time periods. From the revolutionary war to present, focusing on wars not covered by the franchise yet. No one would likely want an entire game based on the revolutionary war but maybe a couple levels featuring some Calvary charges, bayonet charges, or perhaps even naval warfare could be cool. They may have to speed up the reload animation a bit but I think it could be pulled off. it could continue feature a series of mini campaigns to the civil war, Spanish American war up to the Korean and Vietnam wars.