You will be given a definition of a task first, then some input of the task.
Generate a correct and concise answer for the question based on the words in the context.

Context : Captain Geoffrey John Kirkby CBE, DSC & Two Bars (26 August 1918 -- 24 October 1998) was an officer in the Royal Navy during the Second World War, serving mainly at sea in small ships.
Question : In what military organization did Geoffrey John Kirkby serve?
Output:
Royal Navy