Instructions: 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.
Input: Context : Colonel Charles deForest Chandler (December 24, 1878 -- May 18, 1939) was an American military aviator, and the first head of the Aeronautical Division, U.S. Signal Corps that later became the United States Air Force.
Answer : United States Air Force
Output:
Which armed forces utilised the service of Charles deForest Chandler?