 Uncles was assigned to the staff of the Field Artillery School at Fort Sill in 1943, and later that year, he attended the New Division Officers Course, also at Fort Sill.At the end of 1943, Uncles was assigned as commander of the 404th Field Artillery Group, serving until 1944, when he assumed command of the 34th Field Artillery Brigade, which he led in combat throughout France, Belgium and the Netherlands until the end of World War II.In 1945 Uncles was appointed to command the 32nd Field Artillery Brigade in Germany, serving until 1946.