The first HOKs were delivered in April 1953 with the last Huskie being delivered in December 1957.  The inter- meshing rotor system on the Huskie made it extremely stable in flight and particularly in a hover.  The front of the Huskie was constructed almost entirely of Plexiglas providing an excellent view for an aerial observer. With the removal of the copilot’s seat the Huskie could handle two stretcher patients, and sometimes an attendant could be added.  The HOK served primarily as an observation- utility helo.  The rotor blades on this helo were made of wood and covered by a cloth- fabric. Directional control was provided by the servo flaps on the blades trailing edges.