Event Brief
Jul 31, 2026 at 12:00 PM ET
Lockheed YF-12 Mach 3 interceptor never entered service
By The BriefBrief
Lockheed built three YF-12 interceptors that flew above 80,000 feet and Mach 3 but were never approved for service.
WHO: Lockheed
WHAT: Three YF-12 interceptors were built and tested, but none entered service.
WHEN: Jul 31, 2026 at 11:47 AM ET
WHERE: USA
WHY: Procurement costs rose and Vietnam consumed the money, preventing the Defense Secretary from giving a green light.
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