There are a few types of people who are gung-ho for war. As far as I can tell, that is

1. People who have never actually experienced life-or-death situations, and instead have a wholly fictionalized idea of combat.

2. People who were in rear echelon duties who think they missed out on something heroic thanks to military culture.

3. Politicians and other psychopaths, although the former tend to scrupulously avoid placing themselves in any real danger.

People who actually experienced combat don't tend to talk about it, and older generations especially tend to bottle up the trauma.