1917 War Picture

I hope someone may be able to help with information as to where I might get help regarding a 1917 photo that seems to be of a group of soldiers.The photo had no unit info but has been carefully labeled with last names and rank of officers and enlisted men. There is an open car and officers in uniform sitting in it. The rest are standing in front of their trucks. I believe the photo may be Canadian.
Any leads as to where I might go appreciated.