Gunner is a player on kickoffs and punts who specializes in running down the field very quickly in an attempt to tackle the kick returner or the punt returner.
They also carried automated laser cannon turrets programmed to attack inceptor starfighters, along with armor plating and advanced shields that defended against both turbolasers and ion cannons.
Other options for missile defense could include lasers deployed from drones that would destroy incoming weapons and a system that's now in place uses interceptor missiles to blow up ones that are in flight.
For instance, two countries that the U.S. sees as threats, North Korea and Iran, have far more missiles than the U.S. or any other country has interceptors.