This confirms what my mother-in-law remembers, which is that her father served in World War I, but only for a brief time. The draft card shows that he registered for the draft in June 1918. The "Great War" ended less than six months later, in November 1918. I have not been able to find "my" Morris Goldstein in naturalization indexes for New York, but it's possible that he was naturalized as a soldier. Another task for my genealogy "to-do" list.
January 2014 Update: I found a bit more about Morris Goldstein's World War I service.
Military Monday is a daily blogging prompt from GeneaBloggers, the genealogy community’s resource for blogging. It is used by many genealogy bloggers to help them tell stories of their ancestors.