George McCallum is an Anzac who served in World War Two.
Sources
BIRTH NSW Births ,Deaths and Marriages MCCALLUM GEORGE C 11736/1913 (F=ALEXANDER M=SEBELAH J) district TUMBARUMBA
MARRIAGE NSW Births ,Deaths and Marriages 17567/1941 MCCALLUM GEORGE COLIN CAMPBELL married STOCKWELL ALICE district TUMBARUMBA
MILITARY National Archives of Australia MCCALLUM COLIN CAMPBELL : Service Number - NX115773 : Date of birth - 18 Nov 1912 : Place of birth - TUMBARUMBA NSW : Place of enlistment - CANTERBURY NSW : Next of Kin - MCCALLUM ALICE