 Complete the following phrase:  He was subsequently attached to the battleship USS Maine and served as senior Watch officer under Captain William B. Caperton until August 1909, when he was ordered back to the United States Naval Academy for his second tour as an instructor in the Department of Physics and Chemistry. Greenslade was transferred to the battleship USS Michigan in June 1911 and served consecutively as ordce officer and navigator for next three years. During the 