 Beginning in the mid-1970s, the USAF Flight Dynamics Laboratory, working with Teledyne Ryan, developed a piston-powered tactical UAV designated the "XBQM-26 Teleplane".A total of 23 were built, in 13 different configurations.It is unclear if there was ever any intent to adopt the XBQM-26 for operational service, since the program had a strongly experimental flavor, with the different configurations used to evaluate a wide range of possibilities for tactical UAV operations.