Er is een WW1 mod voor Operation Flashpoint released
(niet van mij hoor)

En je heb zoveel mogelijke eenheden Germans begin en laat-oorlog,
French infantry (early and late), crews, static weapons (MG + artillery), vehicles (Armored car, truck, tank), planes
British infantry, crews, static weapons (MG + artillery), vehicles (Armored car, truck, tank), planes
US infantry, marines, static weapons (MG)
Russian infantry, crews, static weapons (MG + artillery), plane
Australian infantry, static weapons (MG)

German infantry (early and late), crews, static weapons (MG + artillery), vehicles (Truck, tank), planes
Austrian infantry (early and late), static weapons (MG + artillery)
Other features :
Non scripted close combat added, fully usable to the player, used by the AI when out of ammo and standing up.
Functional gas masks which can be put on / take off through the action menu, protecting against Gas script and modifying player's vision, breathing sound.
Functional protecting masks which can be put on / take off for tank crews.
Artillery pieces ejecting shells with ejection sound, empty shells remaining some times on the ground.
Airplane pilots eject without parachute.
WW1 mod for OFP BIS-Forums
Rapidshare DL link -- klote