That would be Russia or USA, both of which have many helicopters.
USA, Britain, Italy, Germany all build and operate high tech helicopters.
The US Army named most of it's helicopters after Indian tribes.
Helicopters where used in several medical settings both Civil and Military. One of the most famous of these helicopters was the Bell H-13 Sioux most noted in the show M.A.S.H.
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Some experimental helicopters can fly as fast as 300 mph. However most helicopters in service fly less than 200 mph.
The US Navy owns the most military helicopters, about 800 of them. Many are on ships and at Navy bases all over the world
Most pilots learn on small fixed wing trainers, then graduate to helicopters.
The military helicopter, also known as the Huey, are used for command and control, transportation, and also assault gunships. These helicopters are the most famous military helicopters.
helicopters
There are many different helicopters. Most small civilian helicopters may fly for about an hour, but large passenger or military helicopters can fly for 6 hours or more.
Car,Train,Bus,Planes,Helicopters,Bikes and Carriges.