Nggawe versi sing luwih rumit saka ukara iki Mung patang sasi sawise ngetokake syarat tanker, USAF dhawuh 29 KC-135s pisanan saka Boeing.
Mesthi wae, versi sing luwih rumit saka ukara kasebut yaiku "Mung patang wulan sawise nerbitake syarat tanker, USAF pesen 29 KC-135 pertama saka westjet rock proyek DC-8, Douglas mutusake manawa luwih becik diterusake tinimbang nyerah. "