I notice that some of my teamates tag enemies for me and when they do it helps me out a TON! i want to know how to tag enemies so i can help my team to win. So how do you tag enemies?
You push Up on the D-Pad to equip your visor, and then all you have to do is aim the cursor on the enemy until there is a Red triangle over there head, and they highlight Red. Afterwards it's up to your team-mates to kill your tagged enemy. Hope this helps.
i thought you had to tag them with X after you're in the visor...but i could be wrong I never did it that way. I got the tagging Achievement the way I described. Maybe pressing X is another way.