 In December 1942, Mukerjee was mentioned in dispatches for his distinguished service during the operations in the NWFP.He commanded RAF Station Kohat from 28 August 1943 to December 1944, becoming at that time the first Indian officer to command an airbase.During this time, the British Indian Army officer and author, Major Francis Yeats-Brown, DFC, praised the professionalism and the efficiency of the IAF, based on his experience at the Kohat airbase.