Radioplane developed an experimental XQ-10 variant that was mostly made of plastic, but although evaluations went well, it wasn't considered a major improvement over existing technology, and it did not go into production.

In 1963, when the US military adopted a standardized designation system, the surviving US Army BTT variants became MQM-33s and the KD2R-1, the only member of the family still in Navy service, became the MQM-36 Shelduck.

A variant of the BTT designated the RP-71,[2] also known as the SD-1 Observer and later redesignated MQM-57 Falconer,[3] was built for battlefield reconnaissance, with first flight in 1955.

It had an autopilot system with radio-control backup, and could carry cameras, as well as illumination flares for night reconnaissance.

Although it only had an endurance of a little more than a half-hour, making it of limited use, about 1,500 Falconers were built and the type was used internationally with several different military forces, remaining in service into the 1970s.