5"-54 caliber gun

For many years, the primary medium gun on U.S. warships was the 5"-54 caliber, first the Mark 42 and then the lightweight Mark 45. It is usable against land, surface and air targets.

The Mark 45 is controlled either by the Mk 86 Gun Fire Control System or the Mk 160 Gun Computing System; the Mk. 160 is upwardly compatible with the