Wanzers can be customized with a variety of parts, computers, auxiliary backpacks, and weapons. The player has full control over customizing their wanzers and can do so as long as its total weight value does not exceed its given power output. To field a wanzer in battle, it must have a complete frame of parts: body, left arm, right arm, and legs. Parts with built-in weapons in the body or arm sections can also be equipped on a wanzer. In most "Front Mission" titles, computers must also be installed; these improve the accuracy of the weapons equipped on the wanzer. Auxiliary backpacks and weapons are not mandatory equipment to use wanzers, but are crucial in order to progress through the games. Auxiliary backpacks serve to give a wanzer special features during combat. For example, storage backpacks allow the player to carry extra ammunition or armor repair items.