Gunner was a broad term applied to any person who controlled and fired large-scale weaponry.
The role of a gunner existed on various offensive vehicles, including the Defoliator Deployment Tank, and also on board starships of medium to large size. During the Battle of Hoth, Rebel pilots such as Wes Janson fulfilled the gunner role on T-47 airspeeders, while Alliance gunners engaging in ground combat operated heavy weapons systems.
Certain infantry soldiers who utilized heavy guns were also identified as gunners. A prime example is Moroff, the towering Gigoran mercenary, who was known for wielding a Vulk TAU-6-23 "Blastmill" rotary blaster cannon.