Given the task definition and input, reply with output. Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : Wadysaw Gnys (24 August 1910 -- 28 February 2000) was a Polish pilot of the Polish Air Force and probably the first Allied victor in aerial combat in World War II. In 1931, Wladyslaw Gnys entered military service with the Polish Air Force.
Answer : Polish Air Force
Which armed forces utilised the service of Wadysaw Gnys?