The ụgbọelu e redesignated dị ka YHO-6A dị ka Army si designation usoro, ụgbọelu e redesignated dị ka YOH-6A na 1962 mgbe Department of Defense kere a Joint designation usoro niile ugbo elu. Ise prototypes e wuru, onwem na a 252 shp (188 kW) Allison T63-A-5A, na nyefere ndị US Army na Fort Rucker, Alabama mpi megide ndị ọzọ iri prototype ugbo elu osụk site Bell na Fairchild-Hiller. N'oge nke mpi, na nrubeisi, na YOH-4, e kpochapụrụ dị ka ịbụ underpowered (ọ na-eji 250 shp (186 kW) T63-A-5). The bidding maka LOH ada n'okpuru Bell-Hiller na Fairchild.
Afọ 1963