Anyone completed Crysis One? I am stuck on the section where you are on the aircraft carrier and the big alien has landed on it after the nuke strike. I have the gun that you have to 'tag' the target with but I don't know how to 'tag' anything!?? In Crysis 2 you press the X with the visor but this doesn't work. I've heard that you just use the visor but that doesn't work for me either! Suggestions?