There are cards in both the space and ground combat decks that state something to the effect of" Discard one of your tactics cards in order to block up to two damage".
I have two questions:
1) When I want to use this ability, do I discard both this card and another tactics card? That's what I've been doing.
2) Can the damage blocked be to multiple ships or can only one ship be protected?
I believe the space card is called Outmaneuver or something close. I'm at work and I don't have the card in front of me, so please forgive my memory of the title and text being slightly off.