The job of the Air Force is to provide support for all other branches of the military in combat.
The first category is fighter aircraft. They are used to intercept enemy aircraft, and to a limited extent, bomb, provide intelligence and many other jobs. They also escort other aircraft.
The next category is long range aircraft. They include maritime patrol aircraft, long range reconnaissance aircraft, to name a few.
The next category is large aircraft. These include transport aircraft, bombers, and in-air refueling aircraft.
The next category is helicopters. They include attack and transport helicopters, maritime and land based helicopters, among others.