An Attack Helicopter is a helicopter designed mainly for attacking ground targets with rockets, missiles and often a nose cannon. Nearly all, with one exception being the RAH-66 Comanche, which uses plates which can be folded into the fuselage, use wing pylons for carrying their payload.
Most attack helicopters have a crew of two: a pilot and a co-pilot. In most helicopters, the pilot is responsible for using the primary wing armament, and the co-pilot operates the nose cannon and missiles. One well-known exception, the Ka-50 Hokum (also known as the Werewolf, Helicopter Soldier and Black Shark) has a crew of just one.