Each Planet Map is composed of two or more Battlegrounds. These are:
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Land
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Water
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Air
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Space
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Structs are limited by what Battlegrounds they can be deployed to. For example, a Tank can only be deployed on Land.

Struct offensive abilities are limited by what Battlegrounds they can Target. For example, the SAM Launcher’s RPTR Missile can only target Air and Space. Review your Structs and their abilities to understand how Battlegrounds affect their capabilities.
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Example: The Stealth Bomber is an Air unit that can target Structs on Land and Water. It is vulnerable to Structs that can attack Air units.