Hunter-killer missile

Each weapon with this ability can only be selected to make attacks with once per battle. 
If a **destroyed** model is returned to a unit, all of its **[ONE SHOT]** weapons that have already been selected to make attacks with during the battle cannot be selected to make attacks with again. 
If a new unit is added to an army, all **[ONE SHOT]** weapons in that unit can be selected to make attacks with once per battle.