Gunnery Chief, also known as chief gunnery officer, was a designated assignment on specific Imperial warships, notably Star Destroyers. These individuals functioned as the immediate junior officer to the gunnery captain. Hija occupied this role circa 0 BBY on the Imperial I-class Star Destroyer named Devastator. It is also known that Varnillian held the rank of Gunnery Chief at one stage.
In the year 34 ABY, Peera Maso was similarly assigned to this position on the First Order Mega-class Star Dreadnought known as the Supremacy.