I see the OH officer more as an utility unit (like USF major) than a dedicated combat squad (like UKF officer), it's close range capability (+self buff ability) is just an extra, the focus should be on the very useful smoke arty, aura buff and arty call-ins. In other words, you are not meant to put this unit in the first row of combat.
It's exactly like the UKF officer. That being said, UKF officer 30 muni to reinforce too? IMO both are fine at that cost since they're both very effective CQB squads though.