X-15 with Two External Fuel TanksThe second X-15 rocket plane (56-6671) is shown with two external fuel tanks which were added during its conversion to the X-15A #2 configuration in the mid-1960's.Read More Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/x-15-with-two-external-fuel-tanks/Copy URL to clipboard> DownloadShareSize1041x833px