Battlefield 3 - What the **** are you? Achievement / Trophy Guide
Get the drop on them and melee them, and you'll grab the dogtag automatically. This is on the mission: "Rock and a Hard Place", obviously, as it says so in the achievement / trophy description.
Not sure if it works on the ski masked enemies, I've only gotten this twice from the unmasked guys. But you can reload the checkpoint and try again if you mess up and don't get it, or you killed them all.
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