If an upgrade card does not specify "exhaust" or "discard", can the card be used on multiple actions? As a concrete example, the Annihilator title specifies that "while attacking a squadron, you may reroll 1 attack die." Does this mean that you may choose to reroll one die on each squadron you attack within that firing arc? And to continue the question, if the SSD play chooses to flack out of three arcs then s/he could choose to reroll a die against each squadron in each of the three arcs?

58 minutes ago, Gorsk said:

If an upgrade card does not specify "exhaust" or "discard", can the card be used on multiple actions? As a concrete example, the Annihilator title specifies that "while attacking a squadron, you may reroll 1 attack die." Does this mean that you may choose to reroll one die on each squadron you attack within that firing arc? And to continue the question, if the SSD play chooses to flack out of three arcs then s/he could choose to reroll a die against each squadron in each of the three arcs?

Yes and yes. As the card doesn't exhaust, you can use it on any "while attacking a squadron" chance.