Instructions: Generate a correct and concise answer for the question based on the words in the context.
Input: Context : Admiral John de Mestre Hutchison CVO CMG AdC (4 September 1862 -- 9 October 1932) was a Royal Navy officer who held senior posts during the early part of the 20th century.
Question : What military branch is John de Mestre Hutchison?
Output:
Royal Navy