Signal Corps Sergeant 1st Class 03/26/23
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I was just looking at an old  photo of my great grandfather. He was in
the  99th  aero  squad  in  WWI, which  I  think  I've  written  about
previously. Maybe not.

In any  case, I  noticed that  in this photo,  he had  handwritten the
names and ranks of the people  around him, who were all officers. But,
none of them had sleeve insignia, except him. He didn't bother writing
his own  name or rank, of  course. Saving the memories  for himself, I
think.

Did some digging, and found that his sleeve insignia meant that at the
time he was a Signal Corps Sergeant, 1st class. I don't know know much
about  what  that  means,  but  I  take it  to  mean  he  was  working
communications. Perhaps.