Island Navy Yard, California, where he assumed duty as commandant of the Twelfth Naval district. While in this capacity, his area of responsibility consisted of the following geographic areas Colorado; Utah; Nevada except Clark County; the northern part of California, including counties of San Luis Obispo, Kings, Tulare, Inyo, and all counties north thereof. Greenslade stirred up controversy, during his service at Mare Island Naval Shipyard, when urged that American-born and alien Japanese be excluded from areas of strategic importance. On April 17, 1942, the Navy seized Treasure Island, San Francisco, California, from the City of San Francisco under the direction of Greenslade, and paid no compensation for the confiscated island. Admiral Greenslade claimed Treasure Island was required for "national security" and appropriated the island for the Navy. On the other hand, Greenslade was very instrumental to the development and wartime growth of Naval Station Treasure Island. Following the United States entry into World War II, Greenslade assumed additional duty as Commander, Western Sea Frontier and was promoted again to the temporary rank of Vice admiral on May 1, 1942. His new duty consisted of the sea defense of the Pacific coast of the United States and Mexico and the Eleventh, Twelfth, and Thirteenth Naval Districts were subordinated to his command. Greenslade served at Mare Island until February 1944, when he was succeeded by Vice admiral David W. Bagley and retired from active duty. Greenslade was decorated with his second Navy Distinguished Service Medal for displaying the highest qualities of leadership, judgment and planning in creating an organization to administer the routing and dispatching of convoys and independent sailings from the Western Sea Frontier, and in the initiation and administration of the necessary wartime procedures to most effectively employ available facilities in order to provide services to the Fleet in furthering their efforts against the enemy in the Pacific. He remained on active service and assumed duty as Resources Coordinator on the staff of Commander Western Sea Frontier and established the Pacific Coast Joint Committees for Shipbuilding and Ship Repair and for Ship Operations. In this capacities, Greenslade a system for moving for keeping the supplies moving for the War against Japan. Greenslade served in this capacity until December, 1945, when he retired for second time, completing 46 years of active service. Greenslade was decorated with Legion of Merit for his service as Resources Coordinator and also received Order of