In 1918, most university activities were subordinated to activities supporting the World War I effort. The college was home to U.S. Army training school work and a war-measures school for radio operators. Following the war, enrollment increased. The 1920 freshman class exceeded 300 men — almost twice the size of the previous year, and the university began charging tuition fees. For $245 annually, engineering students could earn a Bachelor of Science degree in civil engineering, electrical engineering, mechanical engineering or chemical engineering.