Question: Robert Lincoln Patterson served during World War I in a branch of the Armed Forces that dates its institutional inception to what year?
Sentence (from "United States Army"): As the oldest and most senior branch of the U.S. military in order of precedence, the modern U.S. Army has its roots in the Continental Army, which was formed (14 June 1775) to fight the American Revolutionary War (1775–1783)—before the United States of America was established as a country.
Relevant evidence: No