How did the helicopter make the world better?

What is hydraulic tank? What is the name of a vehicle used by the army? What is another word for mounted soldiers? Which word does not have a long e sound meager mediocre or cartridge? How fast does the turbofan go? What is the full form of F in F-16? What is a municipal vehicle? How hard is to fly a helicopter? What date was the SR-71 built? How many airplanes have been sold? What is an avenger airplane look like? How many shares do you have to buy to own part of a company? What is the maximum speed of a EF2000 Typhoon? What was the fighter plane proved superior to the Messerschmitt 109? How many Abrams tanks have been lost in combat? What plane did viper fly in the movie top gun? How many war planes does the U S have? What provides guidance for developing a pre accident plan in the army? What is the name of the gas used in bulldozers? Which of the following soldiers can use to determine residual risk for privately owned vehicle trip?