Do Only Enlisted See Combat?

No, Officers and Enlisted both see combat at about equal levels. If you are stationed on a ship where the entire ship engages in combat action then everyone on the ship sees combat. In the Air Force or Naval Aviation of jets, it is the officers that fly the planes while the NCO's / Enlisted stay behind. If you are in the Marines or Army it will probably depend on what rate or job you choose. If you are a scout sniper you can count on seeing combat. If you are an Air Traffic Controller you doubtfully will ever see combat unless the airfield you are stationed at comes under attack or you are attacked in transit in a war zone.