Conversation so far:
When did McCarthy join the military?
In 1942, shortly after the U.S.
entered World War II, McCarthy joined the United States Marine Corps.
What did he do in the Marine Corps?
He served as an intelligence briefing officer for a dive bomber squadron in the Solomon Islands and Bougainville for 30 months.
What did he oversee as the briefing officer ?
CANNOTANSWER.

Question: What did he do after the Marine Corps?
Self-contained rewrite: What did McCarthy do after the Marine Corps?