American Helicopter
Jet Jeep
At the request of the U.S. Army in 1951, the U.S. Air Force initiated the development of a one-man, pulsejet-driven helicopter for observation, liaison and reconnaissance purposes. This unarmed helicopter had to be collapsible, capable of aerial delivery to troops in rugged terrain, and assembled quickly with simple tools. The American Helicopter Division of the Fairchild Engine and Airplane Corp. won the design competition and produced the rugged and uncomplicated Model XA-8. Under the military designation XH-26, the aircraft first flew in January 1952.

Source: Wikipedia