In addition to its focus on intensity and realism, Call of Duty 2 also emphasizes its historical accuracy. All military units in the game actually existed and all of the battles portrayed did occur (although not exactly as portrayed in the game).
Most of the Western Front locations presented in the first two Call of Duty games and the more recent Call of Duty: WWII are quite accurate, especially France. The names of the towns, villages, and even the operations are well-researched (as they should be) and even recreated with decent attention to detail.