Who is it that will "toddle" home when the war is done? all the men who made the rank of major all the young men who fought the battles all the fathers of the young men who fought all the older soldiers who stayed safe and away from the battlefield?

The correct answer is all the older soldiers who stayed safe and away from the battlefield

The narrator says that fathers and young sons will all die in the battlefield but those soldiers that avoided the battlefield would toddle off back home after the war and would die peacefully in their bad. The narrator says that he would sit with majors at the base and wouldn't participate. It's a critique of the system where young people die while powerful men sit around.