I found a relative of mine, Wilton C. Russell, who served in the 516th Signal Corps... according to his headstone application (I would post a link to it, but since I no longer have an ancestry account, it just automatically takes me to the subscription page). On his headstone it shows he served in 516 Sig Service Det, and when I google the name all it shows is the 516th Signal Battalion. So did Wilton serve in a Brigade? What category should he fall under in the military project, if any?
I'm sorry if this has a really simple answer, I'm very confused about what he actually served in.