Well, those reasons you listed definitely took precedent over the war/peace thing. But, I figured that since the military takes its orders from our civilian government, I was supporting its actions whether I joined or not, so I might as well serve for a while.
As for peace-spreading, the military combats terrorism and the occasional homicidal dictatorial regime, and the Navy specifically discourages sea-piracy. More broadly, the sheer size and scope of our armed forces rather limits the actions that the crazy dictators feel comfortable with. And since most violence is defined by its actors as retaliatory, the prevention of violence by individual actors/localized militias allows peace to gain a foothold. That's the theory, anyway. I'm always willing to listen to alternative suggestions.
As for peace-spreading, the military combats terrorism and the occasional homicidal dictatorial regime, and the Navy specifically discourages sea-piracy. More broadly, the sheer size and scope of our armed forces rather limits the actions that the crazy dictators feel comfortable with. And since most violence is defined by its actors as retaliatory, the prevention of violence by individual actors/localized militias allows peace to gain a foothold. That's the theory, anyway. I'm always willing to listen to alternative suggestions.
You might feel somewhat differently if you were a Kurd who'd lived in mortal fear of Saddam's chemical weapons, or a girl in Kabul hoping to go to school without getting blown up. The US may have a dark history of overthrowing peaceful and democratic governments, but we haven't done that in a long time, and, I sincerely hope, won't do so ever again.But to promote peace and goodwill amongst human? That seems quite counter-intuitive.