I think my 2nd mission is bugged. It tells me to intercept and stop 2 merchant ships headed to Mars. I send a squadron at each and only one is stopped. the other is never attacked. So this time I zoomed in and looked. one merchant is clearly labeled what it is and my ships are attacking it. the other is always labeled as UNKNOWN and UNattackable. I even sent the fighters that stopped the other merchant to help with this one and all they do is fly along with it to lose. I cannot attack it since it is unattackable and so I cannot stop it. I guess Im just bugged and will have to delete the game.

And yes it is the correct merchant. It is labeled wit ha red X on the SPACEBAR map screen same as the other one I can stop.

you have to force attack the other merchant ship.