The rules that use the vocabulary item "attack" are:

<ship_class-creatable-sing>

attack boat flotilla

missile attack boat

<ship_class-not_creatable-sing>

attack boat flotilla

missile attack boat

<ship_class-not_creatable>

attack boat flotilla

attack boat flotillas

missile attack boat

missile attack boats

<ship_class-not_creatable-pl>

attack boat flotillas

missile attack boats