Panzergrenadiere are the slaves of the tankers. They are the little ants between them keeping em covered against infantry. In a world war III scenario the average lifespan of tanks is very short. And even shorter for the Grenadiers. They are just dogfood, somewhere between a chain of a friendly tank, a chain of the enemy tank, deafening noise and cracking steel. Simple toys for the tanks to play with. You can expect a quick death here. You'd be better of joining the pioneers.