The funeral of the last British serviceman to serve in both World Wars will be held on Thursday.
Mr Cummins' funeral is being held in Wiltshire
Captain Kenneth Cummins died aged 106. He served in the Royal Navy in World War I and the Merchant Navy in World War II.
Until his death at home in Great Bedwyn in Wiltshire, he was one of five WWI veterans living in the UK.
Dennis Goodwin, chairman of the WWI Veterans' Association, said: "Ken was one of the icons."
In 1918 Mr Cummins witnessed nurses' bodies floating in the ocean after a Canadian hospital ship was illegally destroyed by the Germans.
In WWII, he survived the torpedoing of his ship, the Viceroy of India, which was owned by P&O but used by the military.
Mr Goodwin said: "Any death of a veteran of WWI means the end of a unique and special generation.
"It was the likes of Ken and all the vets who survived World War I who put this country back on its feet and made Britain what it is today."
The four WWI veterans who survive him are: William Stone, 106, of Oxford; Henry Allingham, 110, from Sussex; Philip Mayne, 107, of Richmond, North Yorkshire; and Harry Patch, 108, from Somerset.