Cyril P. Callister called Vegemite, first sold by Fred Walker & Co in 1923. Working from the details of a James L. Kraft patent, Callister was successful in producing processed cheese. The Walker Company negotiated a deal for the rights to manufacture the product, and in 1926, the Kraft Walker Cheese Company Ltd was established. Callister was appointed chief scientist and production superintendent of the new company. Between 1919 and 1927 he had 3 children (two boys and a girl) named Ian, Bill and Jean. They were the original vegemite kids. During World War II Ian unfortunately died Callister got his Doctorate from
Daddy, what did you do in the Great War? on such a scale that "this time there would also have to be a vast recruitment of men like Daddy". There were 1.4 million new volunteers in 1915, up from 1 million in 1914. 2.4 million Britons, or approximately 30% of military aged men, had volunteered for military service. Scholars believe the "scale and nature of enlistment in Great Britain and the Dominions suggest the nations' emotional investment in the war". Stéphane Audoin-Rouzeau and Annette Becker have written that the campaign of mass propaganda, including what they describe as the "guilt-inducing and brutal messages" such as "Daddy, what did YOU