I hangaia e rima tauira, rite rawa ki te 252 shp (188 kW) Allison T63-A-5A, ka tukua ki te US Army i Fort Rucker, Alabama ki te whakataetae ki te tahi atu tekau tauira rererangi i tukua e Bell me Fairchild-Hiller. I roto i te akoranga o te whakataetae, i te tuku, i whakakorea te YOH-4, rite te underpowered (i whakamahia te 250 shp (186 kW) T63-A-5). I heke iho te tono mo te LOH ki a Bell-Hild me Hughes. riro te rererangi i te YOH-6A i te tau 1962 i te wa i hanga e te Tari o te Paremata o te Paremata o te rererangi katoa. E rima tauira i hangaia, rite rawa ki te 252 shp (188 kW) Allison T63-A-5A, ka tukua ki te US Army i Fort Rucker, Alabama ki te whakataetae ki te tekau atu tauira rererangi i tukuna e Bell me Fairchild-Hiller. I roto i te whakataetae, i whakakorea te YOH-4, i rite te underpowered (i whakamahia te 250 shp (186 kW) T63-A-5). I tukuna te tono mo te LOH ki a Fairch
Ko te tau 1963