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At the time, in France, from the age of 20 the French had to do their military service (obligatory). This is how military files were stored, these files indicate the military course and a physical description (color of the eyes, hair, eyebrows, shape of the chin, forehead, nose, and height).
They use the french taxonomy (more realistic at the level of color).
Here, all the military files of some of my ancestors that I was able to recover online:
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