Talk:Tutorial: How to Play/@comment-207.62.170.219-20150504005510/@comment-24266290-20150504010135

It's used for their shelling damage calculation. They can't attack with guns, only with planes.

Shelling (Carriers) : (Firepower + Torpedo) × 1.5 + Dive Bomb × 2 + 55

http://kancolle.wikia.com/wiki/Combat#Damage_Calculations