sentences:  During quiet spells, they would replenish the ready service racks with ammunition from the magazines.The Mark 37 Gun Fire Control System (GFCS) was the primary Fire Control System for the Secondary Battery.There were four Mk37 GFCSs on board; one forward above the navigation bridge, two amidships on either side of the forward stack, and one aft between the aft Mk38 Director and Turret three.