The current Chief of the Defence Staff, the professional head of the British Armed Forces, is General Sir Nicholas Houghton, late Green Howards. He is supported by the Vice Chief of the Defence Staff, by the professional heads of the three services of HM Armed Forces and by the Commander of Joint Forces Command.

Answer this question, if possible (if impossible, reply "unanswerable"): Who is the current Commander of Joint Forces Command?
unanswerable