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Reference.org
M121 (bomb)
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<p>The M121 was a very large <a href="/facts/Aerial_bomb/3vhocvAF">air dropped bomb</a> used by the <a href="/facts/United_States_Armed_Forces/NHVsU9Id">U.S. military</a> during the <a href="/facts/Vietnam_War/W0gfbGTE">Vietnam War</a>. Originally developed from the British World War II-era <a href="/facts/Tallboy_(bomb)/tjL4HMfz">Tallboy</a> bomb to be dropped from the <a href="/facts/Convair_B-36/GUwVqxkc">Convair B-36</a> <a href="/facts/Heavy_bomber/J3q4JzTw">bomber</a>, it weighed 10,000 lb (4,500 kg) and contained an 8,050 lb (3,650 kg) <a href="/facts/Tritonal/z4SIJc6h">Tritonal</a> <a href="/facts/Warhead/DKJ7lyqb">warhead</a>. Production of the M121 ceased in 1955, but stockpiles were retained until the Vietnam War. </p>