Vintage work crew photos

[Toolmaker51]

I would bet some of them fought in WW1...

With guesses at 10-12 years old, some even less. marksbug asks which is Smiley Bob, closest might be back row about 1/4 of the row from left.
A few thin-lipped smiles according to eyes, and some say just forlorn, miserable, desperate.

All the same, safe bet the majority served, responding to this,

or this,

maybe this.


Conscription began 1917, May 18th.