In Call of Duty: Modern Warfare 2, how many consecutive kills does it require to earn the "Tactical Nuke" killstreak?

In Call of Duty: Modern Warfare 2, the tactical nuke killstreak requires 25 consecutive kills to be earned. This number was intentionally set high to add an element of challenge and reward skilled players who were able to achieve such a high killstreak without dying. The tactical nuke was a highly powerful weapon, capable of instantly ending the match and achieving victory for the player's team, making it a significant gameplay feature that required a significant effort to obtain.