The Onward Project seeks to locate and publish a photograph of every member of the New Zealand Expeditionary Force who served overseas during the First World War of 1914-1918. Each image is captioned with the name and service number of the individual, plus a reference to the source of the photo. Three volumes in the series have been published so far, and photos are being collected for a fourth volume.
This Clan Matheson site contains quite a lot of information on Mathesons who served in the First World War, both overseas and in New Zealand. In a comment on one of the pages Christine Barbour says she’s sent the Onward Project a photo of her grandfather, Roderick Dugald Matheson, who is included in our list here. That’s a great idea, and I’d encourage others to do this too.