There are many different types of helicopters. The military uses helicopters for many missions and many other organizations like STARS (Shock Trauma Air Rescue) use helicopters. The main advantages of helicopters are vertical take of and landing and the ability to hover.
Boeing
AH-64D Apache Longbow:
The AH-64D Apache Longbow is one of the world's most advanced helicopters.
Topping it's class in speed, agility, and versatility. The apache is equiped
with six hardpoints and can carry quite a payload! The Apache can be equiped
with: M230 30 mm cammon, Hellfires, Stingers, Starstreaks, Sidearms, Sidewinders,
and rockets!