it is unlocked through prestige challenges and you have to get 100 kills in last stand,alongside this emblem you get a gold title that says 'The Stand'
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Nothing they are the first emblem you unlock.
2nd prestige
Ten Tactical Nukes to unlock the emblem.
It happens to be a title, not an emblem. You're supposed to get 25 kills with fragmentation grenades.
You unlock it by getting to 10th Prestige.