The Dragonfire scorestreak and how to use it

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I haven't had the game long and have only been playing online multiplayer so far. I just earned the Dragonfire scorestreak but I dont know how to use it. Everytime I tried with the conventional method of pressing right on the d-pad, it just kept saying that I couldn't use that here. I tried it inside, outside, against the floor, against a wall, against a vehicle… nothing!

Anybody know how I am supposed to use it?

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