Leutnant Hans Joachim Rolfes was a World War I flying ace

Flying ace

A flying ace or fighter ace is a military aviator credited with shooting down several enemy aircraft during aerial combat. The actual number of aerial victories required to officially qualify as an "ace" has varied, but is usually considered to be five or more...

 credited with 17 confirmed and two unconfirmed aerial victories. He scored his first confirmed victory while with Royal Bavarian Jagdstaffel 32, on 6 July 1917. His second and subsequent victories were with Royal Prussian Jasta 45 during the first nine months of 1918.

Reference

Fokker D VII Aces of World War 1, Part 2. Norman Franks, Greg VanWyngarden. Osprey Publishing, 2004. ISBN 1841767298, 9781841767291