mckellar was also considered a capable leader in combat. aggressive and instinctive, his fighting spirit was an inspiration to his squadron but according to one biographer, he was highly strung, vociferous and blunt with members of his unit. nevertheless, his directness and socially confident nature singled him out for command. his dedication to his job as a fighter pilot and leader led him to refuse any leave from his squadron while the battle of britain lasted. invariably mckellar led from the front of his unit. he spent a large proportion of his time with his squadron practising combat tactics. while intensely loyal to anyone he considered a friend, mckellar's attitude to others outside the squadron was either of utmost friendliness or utter dislike. he is said to have tended to see everything and everyone in black and white.