 Complete the following phrase:  On 18 March 1942, he was promoted to the acting rank of vice admiral and given the honorary ranks of lieutet general and air marshal to have the authority to carry out his duties in Combined Operations; and, despite the misgivings of General Sir Alan Brooke, the Chief of the Imperial General Staff, Mountbatten was placed in the Chiefs of Staff Committee. He was in large part responsible for the planning and organisation of the 