Conversation so far:
What did Stephen Sondheim do in Stephen Sondheim's early years?
When he lived in New York, Sondheim attended ECFS, the Ethical Culture Fieldston School known simply as "Fieldston..
When did he graduate?
He later attended the New York Military Academy and George School, a private Quaker preparatory school in Bucks County, Pennsylvania.

Question: Did he join the military?
Self-contained rewrite: Did Stephen Sondheim join the military?