What does O'Brien conclude about war?

As I turned to the last page of this novel, I anticipated some kind of conclusion about war. Did O'Brien outright conclude something? Not really. But he did make a lot of points about war throughout the stories he folded together.

War is violent; war is emotional; no-one really wins in a war. When you fight in a war, things start blending together. It is hard to know what is real, and what the voices in your head repeat over and over again so stridently that you believe it to be true. Memories of war are constantly changing as time goes on.

War is suffering; war is death, but war is also life. War makes you value your purpose when you make it out alive despite having been shot twice- when you defeat the odds that are against you.

War makes you lose your identity. Sometimes, it makes you wish you were dead. Sometimes, you wish you were dead for long enough that you hang yourself in the middle of a YMCA locker room.