 Complete the following phrase:  For the operation, the corps was placed directly under General Douglas MacArthurs command, rather than being assigned to the US Eighth Army. Advanced elements of I Corps headquarters subsequently moved to Morotai Island in March 1945, followed by the remainder of the headquarters the following month. From there, they directed a series of amphibious landings that were carried out by the 7th and 9th Divisions at Tarakan, 