Rare. Twin counter-rotating main rotors, no tail rotor, complicated double-finned tail assembly.

Unless you are near a Russian naval fleet on maneuvers, this is the only twin-rotor helicopter you will ever see. The Soviet naval helicopters have both of their counter-rotating main rotors mounted on a single mast, and have tails resembling the Huskie. Huskies were once seen at every U.S. Air Force base, where they were used as firefighting and rescue craft. The Huskie was a common sight in Vietnam; now in civilian use only, and extremely rare.