Yup...my favorite M*A*S*H character was Frank Burns. He was a buffoon but the only conservative on the show...even though the writers made him a hypocritical two-timing moron.
In real life most people hated the war. It's natural to hate war. They just didn't go around complaining about it 24/7, like Alda, et al. They did their jobs to end it as soon as possible.
Don't forget Colonel Potter. Old Army all the way. He knew to give his troops some leeway when he had a winning team, but the times they crossed him, well, Harry Morgan was pretty good at protraying "extremely pissed off."