You can Nuke Boost by using Tactical Insertion or you can simply just be on good form; killing anyone.
You can also watch some tips on Youtube.
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Ten Tactical Nukes to unlock the emblem.
Gamemaster4474-- For a 25 kill streak in Modern Warfare 2, you get a Tactical Nuke, which once used, ends the match that you are currently in and counts your team as the win.
Wrong game to get a nuke on
Tactical Knife
Yes you can, you have to get 100 kills with the desert eagle to unlock it.