The Officers' Mess in a Royal Navy ship or base is called the Wardroom. Associated with the Wardoom is a Gunroom, the mess for Midshipmen and occasionally junior Sub-Lieutenants. The Captain of a vessel is not normally a member of the Wardroom, which is always run by the first lieutenant or Executive Officer (XO), thereby known as the Mess President ("Mess Prez"). This post is part of the job of being a ship's XO. Other committee members are generally appointed (voluntarily or otherwise) by the XO.