Generate a correct and concise answer for the question based on the words in the context.

Ex Input:
Context : John Anthony Walker, Jr. (July 28, 1937 -- August 28, 2014) was a United States Navy Chief Warrant Officer and communications specialist convicted of spying for the Soviet Union from 1968 to 1985.
Question : What armed force was John Anthony Walker in?

Ex Output:
United States Navy

Ex Input:
Context : Once a Cop (Chinese: ) is a 1993 Hong Kong action film directed by Stanley Tong and starring Michelle Yeoh.
Question : Who is the director of the film, Once a Cop?

Ex Output:
Stanley Tong

Ex Input:
Context : Charles B. McVay, Jr. (September 9, 1868 -- October 28, 1949) was an admiral in the United States Navy after World War I. In 1907--1909, After the cruise of the Great White Fleet, he commanded the tender, Yankton.
Question : What military branch was Charles B. McVay, Jr. in?

Ex Output:
United States Navy