User blog comment:MyOpsAreBlackerThenYours/Should BF3 add new factions?/@comment-1476628-20120321025924/@comment-770363-20120327233700

@UK13 No, maps taking place on mainland Europe would be non-US and non-UK NATO forces against Russian Ground Forces, and maps set in the British Isles would be the British Armed Forces against Russian Ground Forces or Russian Naval Infantry.

It would not be a choice, it would merely be affected by map. For example, in CoD, you don't choose between all factions to play as on a single map, your "choice" is limited by the map currently being played. Another example, in Left 4 Dead 2, there are DLC's that allow you to play as the characters from the original L4D, but you don't choose between the new guys and old guys on a particular campaign; your choice is limited by the setting you play in.