Douglas Melford Johnson looks like he was a member of the Irish Regiment of Canada. Take a closer look at the Tam/Caubeen as well as his kilt and sporran.
I did a Google search.
Please follow these links.
http://www.ducimus.com/_Nova_Scotia/00000005.htm
http://wwii.ca/forums/showthread.php?t=549
Can Pylon1357 confirm?
Phil