07/15/2006. Remarks by Johan Visschedijk: "This was the low-speed trainer to be for the X-24A. Although three were built, none ever flew nor were accepted by the USAF, so the military titles are inappropriate. One of these three is converted to simulate the original X-24A and is on display at the National Museum of the USAF, Wright-Patterson AFB, Ohio, USA. The original X-24A was converted to the X-24B."