After defending against an attack pool that includes a weapon with the Suppressive keyword, the defending unit gains one suppression token during the Assign Suppression Token to Defender step.
Trooper units have a courage value on their Unit Card. When a unit has a number of suppression tokens equal to or greater than its courage value, it is suppressed. If a unit has a number of suppression tokens that is equal to or greater than double its courage value, it is panicked. A suppressed unit performs one less action each activation, while a panicked unit suffers additional effects.