from: https://www.blastwave-comic.com/index.php?p=comic&nro=1
alt text two soldiers in gas masks (full face respirators) rest in a bombed out city, with poisonous air from a nuclear war surrounding them they wear gas masks.
soldier 1: do you know the meaning of this war?
soldier 2: hmm?
soldier 1: i mean... what's the point it can't be for the land because everything is burned, bombed or polluted. it can't be for the money because there is anything left to spend it on. so what is it? religion? why do we fight?
soldier 2: to win the war.
soldier 1: meh... works for me.
It's actually a decoy target on the helmet, their heads have evolved to be much flatter at the top due to less brainpower usage requiring less space in the cranium.