Task: Question Generation
Input (English): Context : Rear Admiral Frederick Lois Riefkohl (February 27, 1889--September 1969), a native of Maunabo, Puerto Rico, was an officer in the United States Navy and the first Puerto Rican to graduate from the United States Naval Academy and to be awarded the Navy Cross. 
Answer : United States Navy
Output (English): With which military branch did Frederick Lois Riefkohl hold a command?