Sandra Davis didn't serve in the military but for more than 25 years she has proudly marched on Anzac Day to commemorate her father's service in World War II.

Sandra Davis poses with her father's war medals during the Anzac Day parade in Brisbane on Thursday. Credit:AAP

Her dad, Bill Wharton, survived three-and-a-half years as a prisoner of war in the notorious Changi prison after he was captured in Singapore.

His secret diary and sketches of prison life hidden from the Japanese guards form part of the collection at the Australian War Memorial.

"He was a great man, very resilient," Ms Davis, 71, said of her father, who also marched until he died aged 90.