Need help translating military lingo
Are there any Vetrans who can help me understand the following information about my grandfather.This information was written on the back of a photo taken of my grandfather in his uniform.
(I believe he was in the Army/Air force, based on the fact that he has wings on his uniform)
Capt. John C. Head Jr.
490th Services Sqd
13th Service Group
A.P.O. 5165 c/o Postmaster
San Francisco, CA