William McKenzie MC was chaplain to the 4th Australian Infantry Battalion and, at times, the whole 1st Brigade, throughout the Gallipoli campaign and much of the Western Front. He eventually attained the Salvation Army rank of Commissioner. After his return from the First World War, Mac continued to experience poor health and suffered from nightmares and memory loss. He is on record as stating, "I had seen so many fine chaps killed ... I had buried so many, too ... that I had to ask myself again and again, 'Is it worth living?' " Known for his tireless and creative efforts to bolster the spirits of Diggers, he has been dubbed by some as the 'most famous man in the AIF'.