Beller, a male Human, held the position of master chief gunnery officer within an alternative shift's superlaser gunnery team on the Death Star. Being the highest-ranking non-commissioned officer, Beller's responsibility was to finalize the firing process by activating the firing lever upon command. During the event when Superlaser Fire Control commanded the destruction of Despayre to assess the weapon's power, the on-duty master chief, Tenn Graneet, showed hesitation, leading to Beller being suggested as a stand-in if Graneet was incapable of executing his role.