anybody who likes these things to volunteer to do them.
If you like guns, then you need to be on the boat. This wasn't only true of people when I served, but culling our violent people by sending them where they've romanticized their involvement and (tell everyone) they dream of going satisfies that money/mouth issue and reminds them this isn't homeroom any more.
Voting to provide beneficial things like sewage and medicine aren't warhawk problems, so much as they are a hallmark to basic society. Don't conflate "killing in the name of " with fucking "do no harm".