You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Ministry_of_Defence_(United_Kingdom)

Context:
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.

Question:
The professional heads of what three services support the Chief of the Defence Staff?

HM Armed Forces