Introduced in Advance Wars: Dual Strike, the Carrier is a naval unit that can carry up to two air units. Carriers also have indirect anti-air missiles that can strike at a range of three to eight spaces away. These missiles are devastating to all Air units.
Advance Wars: Days of Ruin saw a change to the Carrier's arsenal; instead of carrying anti-air missiles, the unit carries anti-aircraft machine guns. Additionally, Carriers also can produce up to four Seaplanes.
Carriers cost 30000G to produce in Advance Wars: Dual Strike and 28000G to produce in Advance Wars: Days of Ruin. In both games the Carrier can supply and refuel the Air units that land on them, but those air units will be lost if the Carrier gets destroyed.
In battles that feature both Naval and Air units, the Carrier is a fantastic Anti-Air weapon to have in Advance Wars: Dual Strike, as a Carrier can protect your Navy from enemy Air Units.
The Carrier functions completely different in Advance Wars: Days of Ruin. It uses Anti-Air machine guns to protect itself from Air Units, but they aren't as strong as the Anti-Air missiles from the previous game. Additionally, each Carrier is capable of producing one Seaplane unit per day at 15,000G per unit, but each Carrier has enough Materials on board to produce up to four Seaplanes.
In both games, providing support for your Carriers will be important, and not just for your Air Units in general--Seaplanes only have 40 Units of Fuel, so they'll need to take off and land frequently on a Carrier or at an Airport or Temporary Airport.
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