US forces in the CBI were grouped together for administrative purposes under the command of General Joseph "Vinegar Joe" Stilwell. However, unlike other combat theaters, for example the European Theater of Operations, the CBI was never a "theater of operations" and did not have an overall operational command structure. Initially U.S. land units were split between those who came under the operational command of the India Command under General Sir Archibald Wavell, as the Commander-in-Chief in India, and those in China, which (technically at least) were commanded by Generalissimo Chiang Kai-shek, as the Supreme Allied Commander in China. However, Stilwell often broke the chain of command and communicated directly with the US Joint Chiefs of Staff on operational matters. This continued after the formation of the South East Asia Command (SEAC) and the appointment of Admiral Lord Mountbatten as Supreme Allied Commander.