ship was stationed off of Santo Domingo, Dominican Republic, for diplomatic service; Vera Cruz, Mexico; Cap Haitien, Haiti; and returned to Puerto Plata, Dominican Republic, when a crisis recurred there. Deyo's last tour in the Caribbean before marriage and World War I was aboard the destroyer . She sailed to Tampico, Mexico and later supported the U.S. occupation of Vera Cruz. Jenkins was assigned patrol operations to search for possible German U-boats. Deyo married Maria Ten Eyck Decatur Mayo in 1916. As an aide to the Commandant, First Naval District, Boston, 1920–1921, Deyo was a part of an ongoing upgrading of Naval District that would remain in place from 1920 to the outbreak of World War II. The First District absorbed the Second in 1919, and it expanded from a coastal strip to encompass inland states to more nearly correspond to Army districts. The District acquired its own full-time staff, gained new operational functions, and expanded administrative and logistical responsibilities. Proposal for reform of the Naval district regulations were to be revised to embody the lessons of World War I. This is fundamental naval strategy. Mahan had written, "deficient coast protection reacts unfavorably upon the war fleet, which in all its movements should be free from any responsibility for the mere safety of the ports it quits." Deyo's next assignment was as an aide to the U.S. military governor at Santo Domingo, Dominican Republic. Service aboard one ship and command of another prepared Deyo for duty ashore in a politically and diplomatically sensitive role. In 1914–1915, Deyo had served on the armored cruiser during service related to Santo Domingo, Dominican Republic, Vera Cruz, Mexico, and Cape Haitien, Haiti. Capt. Edward W. Eberle, commanding, was active in U.S. attempts to mediate between government and insurgent forces towards a constitutional government with "observed" elections. When then Lieutenant Commander Deyo had his first command, of the destroyer , he was attached to the "Adriatic Detachment" performing political and diplomatic duties among nations of the former Austro-Hungarian Empire. In 1921–1923, Deyo served on the staff of the military governor closing out the American occupation of Santo Domingo. The military governor at the time was Warren Harding's appointment to fulfill his campaign promise to end the Wilson occupation of the Dominican Republic. Rear Adm. Samuel Robison served from 1921. The occupation officially ended July 1, 1924. In 1923 Deyo was assigned to the staff Battleship