Teacher:Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Teacher: Now, understand the problem? Solve this instance: Context: Robert P. Baldwin (October 19, 1917 -- April 7, 1994) was an Army Air Corps and United States Air Force pilot during World War II and Korea.
Question: With which military branch did Robert P. Baldwin hold a command?
Student:
united states air force