Instructions: 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.
Input: Context : Vice Admiral Russell Willson (December 27, 1883, Fredonia, New York -- June 6, 1948, Chevy Chase, Maryland) was a flag officer of the United States Navy and inventor of the Navy Cipher Box (also called 'Naval Cipher Box' or 'Navy Code Box') issued in 1917.
Answer : United States Navy
Output:
What military branch is Russell Willson?