View of the One Man Control station of the Mark 42 5"/54 caliber gun (127mm) aboard the U.S. Navy frigate USS "Capodanno" (FF-1093), circa 1983. The 5"/54 Mk 42 is an automatic, dual-purpose (air/surface target) gun mount. It is usually controlled remotely from the Mk 68 Gun Fire Control System, or locally from the mount at the One Man Control (OMC) station, as shown here.