"All the real soldiers are dead"... So it goes

Another thing that was pretty noticeable was how Vonnegut always refers to the high school teacher as “Poor old Edgar Derby.” He was shot and killed in Dresden and maybe because he was kind of old and had a family back home, Vonnegut feels pity or ashamed for his death, besides they did spend a lot of time together in the hospital and after that.
In the book they make a reference about the war pretty harsh. It criticizes the war and the amount of deaths it had.
“She asked Gluck if he wasn’t awfully young to be in the army. He admitted that he was. She asked Edgar Derby if he wasn’t awfully old to be in the army. He said he was. She asked Billy Pilgrim what he was supposed to be. Billy said he didn’t know. He was just trying to keep warm. “All the real soldiers are dead,” she said. It was true. So it goes.” Pg 159.
This is a very powerful paragraph, at least to me it was. The war was so deadly and it has so many deaths that it is even hard to imagine. Many innocent people, young soldiers and entire families were killed. By the end of the war, there was nobody left and they had to use old, young people and people who had no idea on how to be a soldier. All the real soldiers are dead. And after the Dresden bombings many of the others will be dead to. War is the horrible way for mankind to solve its problems and with this way there are unimaginable amounts of deaths and suffering.