Task: Question Generation
Input (English): 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 (English): Which armed forces utilised the service of Charles deForest Chandler?