When in war, you need to be in service because everyone would be counting on you to do your part. No one should do anything on their own as this is some sort of service to the country. It doesn't matter if you are a soldier or not, you need to do your part because your country is counting on you. If you can only drive a truck then that would be your contribution and you wouldn't fight in the war. It is your job to make sure that the cargoes reach its destination on time. With your line of work, most of the cargoes would be dangerous, so driving with care in mind should be a priority. In this game, you need to drive your truck as fast as you can. Not because you are in war, but because you can't finish the game on time. There are different cargoes in every level and you need to treat them as such. Some of them would be dangerous since it might explode or something then some of them just need to reach the base. Of course, you can pick up some other cargoes along the way. The game gets more difficult as you make some progress.