Part 1. Definition
Generate a correct and concise answer for the question based on the words in the context.
Part 2. Example
Context : Isaac Nicola Romero (1916 in Havana, Cuba -- 1997) was a prominent Cuban guitarist and one of the founders of the modern Cuban Guitar School. 
Question : What was Isaac Nicola's city of birth?
Answer: Havana
Explanation: According to context Issac Nicola's city of birth is Havana. Hence this is a correct output.
Part 3. Exercise
Context : Robert G. Emmens (July 22, 1914 - April 2, 1992) was a Doolittle Raider and a career United States Air Force officer. 
Question : To which branch did Robert G. Emmens belong?
Answer:
United States Air Force