germany
It depends what type of skiing you want to do. There is cross county, helicopter skiing and downhill.
Russia
There are many helicopter flight training schools located in U.S.A. One of the flight training school in the country is the Ridgeline Helicopters. They do most of their training at Arlington Municipal Airport.
The helicopter manufacturing industry.
united states
the united states
yes
Russia is the country with the most MI-24 helicopter gunships. It was produced by the Soviet Air Force in 1972 and is now used by the Russian Air Force as well as many other countries.
Apache helicopter has most missions of fire supports.
There are many different helicopter engines, most of them now jets
i think it was japan at the end of WWII