He was sent to the first ground school class at the University of California Berkeley , and graduated in July 1917 .
When the U.S. entered the war , Harris enlisted in the Army Signal Reserve Corps at San Diego , California .
Harris was sent to the first ground school class at the University of California Berkeley , and graduated in July 1917 .
When the U.S. entered the war , Harris enlisted in the Army Signal Reserve Corps at San Diego , California .