title: Chief of the Air Staff (United Kingdom)
context: The Chief of the Air Staff (CAS) is the professional head of the Royal Air Force and a member of both the Chiefs of Staff Committee and the Air Force Board. The post was created in 1918 with Major General Sir Hugh Trenchard as the first incumbent. The current and 29th Chief of the Air Staff is Air Chief Marshal Sir Stephen Hillier, who succeeded Sir Andrew Pulford in July 2016.[2][3]
question: Who is the current head of the Royal Air Force?
answers: Air Chief Marshal Sir Stephen Hillier