Official rule text
95.2 Any fighters and ground forces that a ship transports must move with the ship and remain in the space area of a system. 97.4 After a player gains a unit upgrade card, each of that player’s units that correspond to that upgrade card is treated as having
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 95.2