Task: Question Understanding
Input (English): 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?
Output (English): military branch