Mockup of the prototype BuNo 137812 Mockup of the prototype BuNo 137812 CNI Installation mockup image by Vernon Tucker who worked closely with Ed Heinneman. Provided by his grandson Ryan Tucker. ES 135656 Douglas A4D 910 11/21-55 CNI Installation A4D Nose CNI Installation mockup image by Vernon Tucker who worked closely with Ed Heinneman. Provided by his grandson Ryan Tucker. ES 135659 Douglas A4D 910 11/21-55 CNI Installation A4D Nose