This is a Notable Operational milestone.
The Doak 16 (US army designation VZ-4DA) was a tilt duct concept demonstrator aircraft. The first flight was a tethered flight.
Source: "Out of the Past Progress? |Doak VZ-4 Tilted Ducted Fan V/STOL", John Schneider, VERTIFLITE May/June 1993, Page 52
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