I can't see what propels these things; no propellers, no air intake - exhaust. ???
Well, you think the only place UFOs crashed was Roswell?
pusher prop in the back.
Two-blade pusher prop driven by Rotax internal combustion engine.
https://en.wikipedia.org/wiki/Baykar_Bayraktar_TB2
https://en.wikipedia.org/wiki/Rotax_912
Light-weight, efficient jet engines are one of the more difficult technologies for manufacturers of more advanced cruise missiles and drones.