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Extraction is a gametype introduced in Halo 4.
The objective is to "extract" more sites than your opponent.
When you get into a site you are able to deploy a ball-shaped device which then extracts nearby UNSC devices. When you are deploying a ball you bring up a device. The ball is then deployed by giving it an electrical charge to activate it. The extraction device will also make an electrical noise and if you listen closely you will hear a beeping sound. It takes 30–45 seconds to extract a site, depending on the map size.