There are also a number of differant types of combat. Combat in 1/10th and 1/12 scale, combat for flying wings, combat with limits on engine sizes and unlimited, to name a few. These all use crepe paper streamers, usually 25 feet in length.

There are guys out there that are also flying full contact combat; essentially trying to knock each other out of the air. But they usually use EPP foam airplanes.
Dennis-