Unstoppable
From Halopedia, the Halo wiki
The Unstoppable medal is awarded when any player gets 10 kills in a row as the Juggernaut without dying. It is a gold medal with a Spartan helmet on it. When someone gets this medal the announcer will shout "Unstoppable!" to the player that received this medal.
- Most likely a reference to marvel comics character The Unstoppable Juggernaut
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