Can you play two copies of this in one turn to reduce the cost of a Capital Ship by 4?

I don't see a rule that prevents this from happening.

cephalgia said:

Yep. And you can damage the objective as many times as it can take without blowing up too for more free ships.

dbmeboy said:

Couldn't you blow it up if you really wanted to?

Yes, you could blow it up too. I chose my wording poorly, thanks for pointing that out. You can't overkill it though.