China-Burma-India Theater
| China Burma India Theater | |||
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| Part of World War II and Pacific War | |||
 Insignia of the CBI Theater (British Indian troops also participated) |
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(British Indian troops also participated)
China Burma India Theater (CBI) was the United States military designation during World War II for the China and Southeast Asian or India-Burma (IBT) theaters. Operational command of Allied forces (including US forces) in the CBI was officially the responsibility of the Supreme Commanders for South East Asia or China. However, US forces in practice were usually overseen by General Joseph Stilwell, the Deputy Allied Commander in China; the term "CBI" was significant in logistical, material and personnel matters; it was and is commonly used within the US for these theaters.
Well-known Allied units in the CBI included the Chinese Expeditionary Force, the Flying Tigers, transport and bomber units flying the Hump, the 1st Air Commando Group, the engineers who built Ledo Road, the 5307th Composite Unit (Provisional), popularly known as "Merrill's Marauders", and the 5332d Brigade, Provisional or 'Mars Task Force', which assumed the Marauders' mission.
In 1941 the U.S. made a series of decisions to support China in its war with Japan. Lend Lease supplies were provided after President Franklin D. Roosevelt announced the defense of China to be vital to the defense of the United States. Over the summer, as Japan moved south into French Indo-China, the U.S., Britain and the Netherlands instituted an oil embargo on Japan, cutting off 90% of its supplies. Japan cut off Allied supplies to China that had been coming through Burma. China could be supplied only by flying over the Himalaya mountains ("The Hump") from India, or capturing territory in Burma and building a new road—the Ledo Road.
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