Armistice Day/Veterans Day

The eleventh hour of the eleventh day of the eleventh month. That's when it all ended in 1918. The war to end all wars. It's a public holiday in France today to honor the end of WWI. My paternal grandfather arrived in America just a few years before the war broke out and when the US jumped in, he signed up. For him it was a chance to become a US citizen, provided that he survived. Fighting in the Army he made it through Verdun and was wounded at Chateau Thierry but made it back to Philadelphia. After arriving back home he became a US citizen, raised a family of six children with my grandmother and was a cop in Philly. None of us really knew much about what he did until after he died when we found his army papers.

Anyone have any family that became US citizens this way as well? I think (but am not sure) that it was a relatively common way of becoming a citizen back then, perhaps today as well.