There are some returning features from "Front Mission 2" that are used for mission play though, namely Action Points (AP) and Links. Action Points (AP) is a feature that dictates how much actions can be done with each unit. Actions such as moving and attacking require a certain amount of AP to use. At the end of a full turn, which is one Player Phase and Enemy Phase, a set amount of AP is replenished. A unit's AP amount value depends on how many combat ranks its pilot has earned; these are earned by destroying enemy units. Links is a unique ability that allows multiple units to provide offensive support to each other during Player Phase battles. Links operates differently in "Front Mission 3"; a unit's pilot must have a Link-class skill and the appropriate weapons (which also acts as their linked actions) equipped. Once this condition is met, a linked battle will commence if the skill activates. Up to three units can be linked together to form one "link".