I'm hoping you military types, Navy in particular, can help. We need a print source for World War II Navy post office codes. We found a source online:

but need a source we can cite in a court decision. We're specifically interested in No. 3115 FPO SF in New Guinea. 
I already checked with the US Navy Memorial Foundation in DC.
Allison Mays Fentress
U.S. Court of Appeals for Veterans Claims
625 Indiana Ave. NW
Washington, DC  20004
(202) 501-5861
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