Official rule text
95.3 Fighters and ground forces cannot be picked up from a system the attributes and abilities printed on that upgrade card. Any that contains one of their faction’s command tokens other than previous attributes of that unit, such as the one printed on that the active system. player’s faction sheet, are ignored.
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 95.3