Given the task definition and input, reply with output. Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : Captain Peter Gerald Charles Dickens DSO, MBE, DSC, RN (6 April 1917 -- 25 May 1987) was a Royal Navy officer during World War II and a great-grandson of novelist Charles Dickens.
Answer : Royal Navy
What army did Peter Gerald Charles Dickens serve in?