With the entry of the United States into World War I in 1917, the Army opened Camp Zachary Taylor on the outskirts of Louisville, Kentucky. It was the largest Army training camp in the country at that time. Designed for 44,000 men, the camp at its peak housed 59,900. In this video, historians discuss the camp’s history, including the Army’s first physical training program, the African-American 814th Pioneer Infantry, the naturalization of foreign-born soldiers who enlisted, and the deadly influenza outbreak in fall 1918. After war’s end in 1918, Camp Zachary Taylor was closed in 1921.