This was from an old World War 1 advert for a 'war dictionary' for your son, full of 300 words so that he could be understood in Europe or even by the enemy... or at least that's how they sold it.
This is a completely free image Boy Solider - Halt! that you can download, post, and use for any purpose.
Image License: CC0 No Rights Reserved
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, and at no cost. This image is completely free.