The US Navy Mark 37 Director was used to control the fire of the 5”/38 caliber dual purpose batteries against both aircraft and surface targets, to direct the fire of starshells for the illumination of surface targets and to position the searchlights. These directors were commonly installed on many classes of US Navy and US Coast Guard ships from World War II through the Vietnam War. Some ships of the Royal Navy carried this director including the Royal Navy's last battleship, HMS Vanguard.
Unlike the early "square-back" (click here), the late "Square-back" Mk.37 directors featured a shielded, open director captain position (also known as a "Control Officer's Cockpit"), three observation hatches instead of five, and just two telescope port covers, one for the "Pointer" and one for the "Trainer". Many earlier Mk.37 directors were modified to this configuration. Some battleships of the Iowa class were retrofit with a boxier Mk.37 director when modernized in the 1990s (click here).