In the early 1960s, NATO issued NBMR-3 — Basic Military Requirement 3 — for a supersonic V/STOL strike fighter that could disperse from bombed-out runways and operate from forest clearings. The assumption was chillingly simple: in the first hours of a Warsaw Pact assault, every fixed airbase in West Germany would be a smoking crater. Whoever could keep flying without a runway would win the air war. Britain answered with the Hawker P.1154. France answered with something far more audacious: the Dassault Mirage IIIV.

The airframe was recognizably a Mirage III delta, but stretched and reinforced to house eight Rolls-Royce RB162-1 lift jets buried vertically in the fuselage — four in front of the wing, four behind — plus a single SNECMA TF-104 (later TF-106) turbofan for cruise thrust with a swiveling nozzle for transition. Nine engines total. The lift jets were extraordinary pieces of engineering: 2,000 lb thrust each at 125 lb of engine weight — a thrust-to-weight ratio of 16:1, achieved by using fiberglass compressor blades and running for only 90 seconds at a time.

The prototype Mirage IIIV-01 hovered for the first time on February 12, 1965, at Melun-Villaroche. On March 24, 1966, the second prototype, IIIV-02, completed a full transition from hover to horizontal flight. Then, on September 12, 1966, it hit Mach 2.04 — becoming the only VTOL aircraft in history to exceed Mach 2. The F-35B does Mach 1.6. The Yak-141 barely scraped Mach 1.4. Nothing since has matched what a French delta with nine engines did in a single afternoon over Île-de-France.

Two months later, on November 28, 1966, IIIV-02 crashed on landing. The pilot survived. The program did not — at least not politically. The problems were brutal and honest:

• Hot gas reingestion: eight lift jets exhausting downward at close spacing created a fountain of hot exhaust that got sucked back into the intakes, causing thrust loss precisely when thrust loss was fatal.
• Dead weight in cruise: those eight lift jets were useless above 50 knots. You were carrying a ton of hardware that did nothing but consume volume, fuel capacity, and payload.
• Runway erosion: the exhaust melted asphalt and blasted grass fields into craters.
• No mission radius: after burning fuel to hover, then transition, then fight, the aircraft had a combat radius under 250 km.

France cancelled in 1966. NBMR-3 collapsed. Only the subsonic Harrier survived, by accepting a single vectored-thrust engine and Mach 0.9 as the price of not carrying dead weight.

Why revisit it now? Because every problem that killed the IIIV has a 2026 answer. Hot gas reingestion is solvable with CFD-optimized lift fan placement and cooled exhaust — exactly what the F-35B's Rolls-Royce LiftSystem proved works. Dead-weight lift engines are obsolete: modern electric ducted fans powered by a turbogenerator can spin down and feather in cruise, contributing zero drag. Composite airframes cut the structural weight that forced the IIIV to carry eight lift jets in the first place. And fly-by-wire transition control — impossible with 1966 hydromechanical linkages — makes the hover-to-cruise handoff routine rather than test-pilot heroics.

The IIIV proved that supersonic VTOL is aerodynamically real. What it lacked was electronics, materials, and a propulsion architecture that didn't punish you for hovering. We have all three now. A modern hybrid-electric supersonic VTOL, sized for dispersed operations against a peer adversary shooting cruise missiles at every runway in the Pacific, is exactly the airplane the Marines and the Taiwan Strait scenario are quietly begging for.