"The trenches are still here on the farm, although the blackberries have grown over them."
David also watched the soldiers making ammunition by opening the ends of shotgun cartridges and pouring in melted candle wax before re-sealing them.
"It would come out like a bullet."
David says the photograph, which belonged to his father, always intrigued him.
"There's my father with a machine gun. I never saw them with a machine gun - it must have been borrowed. As a six or seven-year-old I would have noticed a machine gun.
"I do remember the convoys coming through Waipukurau. They had a Jeep, a Valentine tank and an anti-aircraft gun. They'd pull up in St Mary's Road in Waipukurau near the primary school.
"I remember sitting in the seat turning the handle on the anti-aircraft gun. It was very exciting as a small child. I think the convoys were to build morale."
David had a larger photo of the entire Waipukurau Home Guard, taken under large elm trees on the Waipukurau Primary School field. He has donated that picture to the Central Hawke's Bay Museum.
"But I have kept this smaller one as it was my father's platoon and consisted of men from the Farm Road, Middleton Road and Arlington Road area.
"I'd love to know who the others in the picture were. I'm hoping people will look at the photo and say 'look, there's my grandfather,' and pass on the names."
If you can supply any more names, please email editorial@chbmail.co.nz or message CHB Mail on Facebook.