The heavy bomber that forced a general to rename an aircraft

Wars & Conflicts · Published 17 October 2026 Swipe more like this →

In short: In 1941, the Mitsubishi Ki-21 was a marvel of Japanese engineering, capable of reaching speeds and ranges that few twin-engine bombers could match. Yet, its design was so distinct that it caused a diplomatic headache for General Douglas MacArthur, who demanded a name change to avoid a personal slight.

The Mitsubishi Ki-21, known to the Allies as the 'Sally', was born from a 1936 requirement for a heavy bomber exceeding 400 km/h (250 mph) with a 750 kg (1,650 lb) bombload. Mitsubishi won production status over Nakajima in November 1937, entering service in August 1938. Early combat revealed flaws like lacking self-sealing fuel tanks and insufficient armament, leading to iterations like the Ki-21-Ib and Ic. By Pearl Harbor, rapid Allied advancements rendered the Ki-21-I series largely obsolete. The aircraft was versatile, serving as a civilian transport (MC-21), glider tug, and for 'special commando' missions. In 1945, Ki-21-IIb aircraft delivered raiders to Yontan airfield, destroying 70,000 US gallons of fuel.

theme-key: hidden-mechanisms mood-key: reflective difficulty-key: 2 topics-key: [military-history, aviation-engineering, world-war-ii]

claims-key: ["The Ki-21 was required to have a top speed of 400 km/h (250 mph) and a bombload of 750 kg (1,650 lb).", "S1:p2", "The Ki-21 was initially designated 'Jane' but renamed 'Sally' because General Douglas MacArthur objected to the name being the same as his wife's.", "S1:p16", "The Ki-21-IIb was mistaken for a new type and called 'Gwen' because it lacked the long dorsal 'greenhouse' canopy.", "S1:p16", "A Ki-21-IIb strike in May 1945 resulted in raiders destroying 70,000 US gallons (260,000 L) of fuel at Yontan airfield.", "S1:p14"]

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