South African pilots with higher numbers of kills were members of the British Royal Air Force, such as Pat Pattle and a fighter pilot who led No. 74 Squadron RAF during the height of what?
John Frost (SAAF officer):  South African pilots with higher numbers of kills, such as Pat Pattle and Adolph "Sailor" Malan, were members of the British Royal Air Force. Adolph Malan: Adolph Gysbert Malan, (24 March 1910 – 17 September 1963), better known as Sailor Malan, was a South African fighter pilot and flying ace in the Royal Air Force (RAF) who led No. 74 Squadron RAF during the height of the Battle of Britain.
Battle of Britain