U.S. Navy
USS Vincennes Iran Air Flight 655 Shoot-Down
Estimated impact: 290 civilian lives; severe diplomatic consequences
USS Vincennes shot down Iran Air Flight 655, killing 290 civilians, after misidentifying the commercial Airbus A300 as an attacking F-14 fighter. The Aegis combat system correctly identified the aircraft, but crew members under stress interpreted the data to confirm the threat they expected.
Decision context
Whether to fire on an aircraft in a commercial air corridor that the Aegis system identified as climbing (not descending in attack profile) and on a civilian transponder frequency.
Decision anatomy
Red = risk factor present · Green = protective factor present
Biases present in the decision
★ Primary driver · Severity estimated from bias type and decision outcome
Toxic combinations
Reference class base rates
Across all 143 curated case studies in our library:
Lessons learned
- Confirmation bias under combat stress: the crew expected an attack and interpreted ambiguous data to confirm that expectation
- Availability heuristic: the recent USS Stark attack (1987) made an air attack seem more likely than it was
- The Aegis system provided correct data, but human interpretation under stress filtered it through preexisting threat expectations
Source: Fogarty Investigation Report, U.S. DOD (1988); International Court of Justice proceedings (Post Mortem)
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