The Disband ability is a unit ability that removes a unit, deducts its point value from the player's score, and returns half of its cost, rounded down to the nearest star. Like other unit abilities, the Disband ability can only be used on any given turn by units that have not performed any other actions that turn (e.g. moving). The Disband ability is unlocked by the Free Spirit technology.
Disbanding a super unit returns five stars. (Super units have a theoretical cost of 10 stars.) Disbanding a Ship or Battleship only returns half the cost of the base unit it carries. No portion of the cost of the upgrade from a Boat is returned.