Tempest was commissioned as a temporary second lieutenant on 30 November 1914, to serve in the
King's Own Yorkshire Light Infantry. On 18 August 1915 he was granted
Royal Aero Club Aviators' Certificate No. 1604 after soloing a Maurice Farman biplane at the Military School in Birmingham, and on 3 November he was appointed a flying officer in the
Royal Flying Corps, transferred to the General List. He served in
No. 6,
No. 15, and
No. 29 Squadrons, He was posted to
No. 64 Squadron in July 1917, Tempest gained his first aerial victory on 30 November 1917 flying an
Airco DH.5 single-seat fighter, by driving down out of control an
Albatros D.V. His squadron was re-equipped with the
S.E.5a fighter in early 1918, and Tempest shot down five enemy aircraft in March. On 1 April 1918, the Royal Flying Corps was merged with the Royal Naval Air Service to form the Royal Air Force, and his unit became No. 64 Squadron RAF. Tempest destroyed two more aircraft that month, then two more in May, also being awarded the Military Cross on the 13th. He accounted for one enemy aircraft in June, and another in July, and finally five in August, before being posted back to England, where on 2 November he was awarded the
Distinguished Flying Cross. while Major
Wulstan Joseph Tempest also served in the KOYLI and Royal Flying Corps, shooting down Zeppelin
L.31 over
Potters Bar on 1 October 1916 while serving in
No. 39 (Home Defence) Squadron. He was subsequently awarded the Military Cross and the
Distinguished Service Order. ==List of aerial victories==