Bell YH-40 US ArmyThese are 1 72 scale decals for the Bell YH 40, the pre production service test variant of the helicopter that would become the legendary UH 1 Iroquois. Following the successful XH 40 prototype flights, the Army ordered a batch of YH 40 service test aircraft to evaluate the design under operational conditions before committing to full production. The YH 40 incorporated refinements over the prototype and was used to work out the details of Army service