There are tons of contracts in the USN that absolutely guarantee that you will never see anywhere close to combat. All Nukes only serve on Carriers and Subs. Corpsmen (Navy Doctors and nurses) tend the wounded. You KNOW what you are signing up to do before they ever even send you to MEPS for medical testing. The only people that might not have specifically signed up for firing a weapon is whoever launches the missiles that we shoot from our frigates. I don’t know if “Gunner” is still a job, but I would assume it is since the Navy has all the big guns. I can’t speak to what happens in the fleet. I went to Navy Nuke school, learned to operate power plants, and they gave me a new extremely lucrative contract to stay there and teach other people to operate power plants. I also cannot speak for The Army, Air Force, or Marines. Though with the first and third, it’s hard to imagine that one wouldn’t know that they are signing up to potentially kill people.