Black Jack and the troops

I like interviewing people. Too bad I was not savvy enough to ask my grandfather very many questions about his past, although I clearly recall his telling me, "I served in The Big Red One under Black Jack Pershing."

Grandpa is the corporal seated on the chair. I don't know who any of the others are. Among his souvenirs is this missive from General Pershing. Click on either image to enlarge.