By mid-1945, United Kingdom leaders were proposing that a combined Commonwealth corps comprising five divisions be assembled in India, and that they be introduced to the campaign in Operation Coronet – landings on Honshū, near Tokyo Bay, during March 1946. By the time of the Potsdam Conference, however, MacArthur was insisting that only three divisions should be part of the combined Commonwealth corps, as part of a US army-level formation. MacArthur also proposed that: the corps should be kept in reserve rather than taking part in initial landings; it should not include Indian Army units, due to "linguistic and administrative complications", and; in the interests of rationalising lines of supply, the Commonwealth divisions should be re-organised to resemble US divisions, as well as being trained and equipped with US weapons, vehicles and other key equipment. Besides questions of American national prestige, which undoubtedly weighed heavily, behind these conditions was a desire to simplify the lines of communication and the logistic support arrangements of the invasion force. Indeed, once established in Japan MacArthur intended to switch his strategic lines of communication direct to America.