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I saw the thread recently about calling in a predator missile when the game is about to end to do this glitch, but heres an alternate way.
When the game is about to end, go up to a care package and start retrieving it. Make sure you are holding down whatever button you use to retrieve it WHILE the game ends. After it ends, you can still use the killstreak, and also run around the map knifing people on the enemy team. They do die, but it doesn't count towards your killstreak. This lasts for about 20 seconds.
- i did not find this but i decided to share
+ rep if you use it