Generate a correct and concise answer for the question based on the words in the context.

Context : Alfred Verhulst was a Brigadier General in the United States Air Force.
Question : Which armed forces did Alfred Verhulst serve?
United States Air Force

Context : The film was adapted by Wilder and Edwin Blum from the Broadway play by Donald Bevan and Edmund Trzcinski which was based on their experiences as prisoners in Stalag 17B in Austria.
Question : The Stalag 17 is based upon what?
Donald Bevan

Context : State testing began on 24 November 1974, and the Kh-25 entered production in 1975.
Question : What year was the service entry date for Kh-25?
1975