Back2Fronts is an extensive mod that will overhaul your Call of Duty 2 game to a next level. This mod brings more variety, intensity, realism and battle-like experience. Try new weapons, fight new enemies, fulfil new missions and explore new options. Mod is SP and MP friendly (although primary part is SP).
The custom missions are quite poorly checkpointed even compared to the bad job vanilla CoD 2 does (most noticeable with the American custom missions). Also sometimes a flak gun will be destroyed by allied anti-tank troops before you can use it forcing you to restart the level. Otherwise it's a nice addition to the game, the new weapons are fun and new levels add to the experience for veteran players.