converts these into range and deflection orders to his Sight Setter. After firing, he observes the fall of his shot, and makes sight corrections to his Sight Setter if necessary. Gun Captain The Gunner's Mate(s) responsible for maintaining the mount. Daily, he goes through a process of checking fluid levels, lubricating bearings, cleaning gun sights, cycling powered equipment, testing firing systems, checking gas pressures, and verifying that all the equipment that will be needed in an action is in his mount. In twin mounts, there will be a gun captain assigned to each gun assembly. The gun captain usually stands on his foot high tool box welded to the mount's deck, and offset from the gun's centerline (see the man in black standing on the box in the MK21 open mount picture). This places him high and aft of the rammer motor. From there, he can watch the actions of the powder-man, projectile-man, breech block, and rammer. He can verify that the gun returns to battery before the next round is loaded. If something goes wrong, he is free to move around his gun to fix the problem. He knows everybody's job, and can step in if necessary. At the mount captain's command, he manually opens the breech block before the first round is loaded, and reports if the bore is clear. His duties are the same in automatic or local control. Pointer Controls the mount's elevation and firing. He sits in the left front corner of the mount. In front of him, are his optical sight, hand wheels, and elevation drive controls. To his right, about elbow high, is a large box called the Elevation Indicator Regulator. (pictured) This box controls the elevation power drive. Through a window on top of the box, he sees a set of dials that indicate the elevation of the gun, and the automatic elevation orders coming from the Fire Control System. Above the Indicator Regulator is the Electrical Fire Select Switch. It is a rotary switch with three positions: Off, Local, and Auto. Off disables the electrical firing system on the mount. Local enables the electric firing key on his right hand wheel. Auto enables the off mount electrical firing circuit from the Fire Control System. Just outside his right knee, is the Percussion Select Lever. This mechanical lever has two positions: Safe, and Armed. When it is in the armed position, the