Day of Infamy:Creating Levels
Currently the only supported factions in the game are the American and German armies. In the future, there may be countless different factions supported and thus different potential settings. For now, it would make the most sense to create a map that supports the American vs. German army factions if you wish for your map to get included in the current version of the mod.
If you wish to create maps that take place in other theaters, this is fine, but your map may not be included until the character and weapon content gets created to support your map.
For more information about how to create levels for Insurgency, check out the Wiki section related to Creating levels. We will provide additional information in this section for DoI specific things that don't apply to Insurgency.