duty as an instructor in the Department of Physics and Chemistry. While in this capacity, he taught several future World War II admirals including Chester Nimitz, Royal E. Ingersoll, John H. Newton, Aubrey W. Fitch, Frank J. Fletcher, Robert L. Ghormley, John S. McCain Sr., John H. Towers and Russell Willson. Greenslade was promoted to Lieutenant on January 1, 1905, and was transferred to the protected cruiser USS Cleveland in September 1906. He served as ship's navigator and took part in the Cuban Pacification several weeks later, when he commanded a landing force at Cienfuegos, Cuba. Greenslade then assumed command of gunboat USS Paducah and commanded this vessel during the patrol in the Caribbean until December 1908. 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 ordnance officer and navigator for next three years. During the Veracruz Expedition, he led Michigan landing battalion ashore. He was promoted to Lieutenant commander on March 4, 1911. World War I Greenslade began his third tour of duty at the United States Naval Academy in January 1915, when he rejoined the Department of Physics and Chemistry as an Instructor and following his promotion to Commander on August 29, 1916, he was appointed Head of the Department of Gunnery and Ordnance. He remained in that capacity for one year and subsequently was ordered to Washington, D.C., where he joined the staff of the United States Naval Institute as a secretary and treasurer. While in this capacity, Greenslade authored Landing Force Manual, which was adopted by the Navy in 1918. He served in this capacity until the end of January 1918, when he assumed command of newly commissioned minelayer USS Housatonic at Bethlehem Shipbuilding Corporation in Hoboken, New Jersey. Greenslade embarked with his ship for Europe and carried 830 mines, which Housatonic planted within North Sea Mine Barrage between June and October 1918. The objective was to inhibit the movement of U-boats from bases in Germany to the Atlantic shipping lanes bringing supplies to the British Isles. Greenslade was decorated with Navy Distinguished Service Medal for his wartime service and was promoted