China Burma India Theater (CBI) was an umbrella term, used by the United States military 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.