US Army Off-road Truck Driver 3D is a 3D off-road military truck game with a story-based campaign. The story is about a soldier who is on a mission to deliver supplies and other items to various military bases. You have to drive on difficult terrain and difficult roads, which makes the game more challenging and fun. 

The player will have to drive the truck and deliver the supplies and other items to the military bases. The player will be able to choose from various missions, such as delivering a supply to a military base, delivering a shipment to a military base, etc.