There isn't much data either way. When Angel serves as your gunner during a mission in the Enigma series in WC2, she refers to the position as "your gunnery officer". It is possible that the other gunners are enlisted. We've seen evidence of other officer gunners on other fighters - when Blair lands his Sabre aboard the Gettysburg in Special Operations 1, his gunner is one Lieutenant Haley. Spirit's gunner during the Novaya Kiev mission where she is killed was named Meron, but we don't know whether he was an officer or an enlisted man. It doesn't appear that the WC2 Broadswords have a co-pilot. The WC Academy TV Broadswords do have a co-pilot who may have acted as a gunner, as the turrets were otherwise unmanned on that version of the ship.