I'm unaware of any DC war books amongst the Church collection. There WERE comics that Church purchased as late as 1962 (and a few later?), but the runs petered out quite a bit by the mid-50s as I recall. . .and I don't know of a single Church copy of ANY DC war book much less an OAAW 83.
That WOULD be cool, though, if it DID exist.
Edgar Church passed away in 1978. Chuck Rozanski purchased his entire collection from his children who had little knowledge in the comic books but wanted his house to be sold immediately before the value went down due to the ethical people moving in his old neighborhood.
Edgar was 90 years old and was probably in a caring home. He was too old to tell his children about his collection.
He collected the comic book in 1930's until 1950's. OAAW #83 was printed in 1959. I doubt that he collected the war comics not even EC Comics. He may be a religious person. Who knows. You can always ask Chuck. He was slowly selling the entire collection one by one for ten years. I am sure that he may remember most of it.