Changes

''A dual-purpose gun developed and deployed by the United States that is capable of surface and anti-air combat.<br>This equipment is a twin-mounted version that adopted a new type of ammunition to increase its fire rate.<br>By placing it in a concentrated deployment, it was used as powerful anti-air armament on the anti-air cruisers in charge of fleet air defense.<br>It was equipped on the Atlanta-class cruisers, and was used for short-range shelling in night battles.

''A dual-purpose gun developed and deployed by the United States that is capable of surface and anti-air combat.<br>This equipment is a twin-mounted version that adopted a new type of ammunition to increase its fire rate.<br>By placing it in a concentrated deployment, it was used as powerful anti-air armament on the anti-air cruisers in charge of fleet air defense.<br>It was equipped on the Atlanta-class cruisers, and was used for short-range shelling in night battles.

==Notes==

==Mechanics==

* Is essential for [[AACI]] n° 40, 41.

* Is essential for [[AACI]] n° 40, 41.

* Is required for [[AACI]] n° 39.

* Is required for [[AACI]] n° 39.

===How To Obtain===

===How To Obtain===

'''Stock equipment of:''' {{Ship/Link|Atlanta Kai}}, {{Ship/Link|Atlanta}}

'''Stock equipment of:''' {{Ship/Link|Atlanta Kai}}, {{Ship/Link|Atlanta}}