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Type of cornerback in American football
The circles highlighted in red are the jammers.
In American football, jammers are a specialized type of cornerback. Their task is to try to slow down gunners during punts by preventing them from getting a free release, giving punt returners more time to return punts. Depending on the special teams strategy, a special teams coordinator may choose to double-team the gunner. A jammer is typically played by a back-up for another position.
