Task: Question Answering
Input (English): Context : Admiral Horacio Rivero, Jr. (May 16, 1910 -- September 24, 2000), was the first Puerto Rican and Hispanic four-star Admiral, and second Hispanic to become a full Admiral in the modern United States Navy. 
Question : Which military branch is Horacio Rivero, Jr. a part of?
Output (English): United States Navy