There are 3 kinds of supplies: Food, Ammo, Fuel.
(1) Food: food is necessity for every troop. Morale will decrease when food is used up, which results in "Fleeing" when Morale reaches 0. Health of the troop will also begin to lose every minute in "Fleeing".
(2) Ammo: troop consumes Ammo when attacking. It stops attacking when Ammo is used up.
(3) Fuel: all troops consume Fuel when moving except infantry. Army and Navy cannot move when Fuel is used up, while Air Force troop crashes instead.