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.[1] 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.
![](http://upload.luquay.com/wikipedia/commons/thumb/0/09/Jammers.png/299px-Jammers.png)