Experimental targeting and spotting drone for USMC. Three conversion from QH-50D during Apr68. List of Operators of Gyrodyne QH-50D Nite Panther From Organisation with model QH-50D Nite Panther Construction Numbers Help Us C/NYearHistory DS-1700 1968 001700 DS-1701 1968 001701 DS-1702 1968 001702 3 C/N.