SU, or Support Units, is the total "value" of units that you can build in Homeworld: Deserts of Kharak similar to the system in Homeworld: Cataclysm. It can be thought of as the total amount of food, water, fuel and spare parts that can be constantly provided to support your fleet. Small units like Light Attack Vehicle (Coalition) cost only 2 SU while larger vehicles cost a lot more, so you will need to find a careful balance of what to build.

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