During the course of the next three years, three helicopters would be evaluated as candidates to replace the OH-13 and OH-23; the Sud-Ouest Djinn, the Hughes 269, and the Brantly B-2. The aircraft were designated the YHO-1 DJ, YHO-2 HU, and YHO-3 BR, respectively. By October 1958, service testing of Sud Aviation YHO-1 DJ was completed. The following year saw the completion of the desert and temperate temperature testing of the YHO-2 HU. The YHO-3 BR did not complete user testing after engineering evaluations revealed significant deficiencies. Service testing demonstrated that the YHO-2 had been the most capable, but due to a limited load capability, it was deemed not suitable to replace the OH-13.