5"-54 caliber gun
For many years, the primary medium dual-purpose 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, sea and air targets. It is full-automatic and has a range of 13 nmi (14.9 mi).
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 5"-62 caliber gun.