as ''O'Higgins'' in the Chilean Navy at Philadelphia Navy Yard in June 1951. During the opening months of the United States involvement in the World War II, Brown commanded
Richmond during the escorting reinforcement convoys to the
Galápagos Islands and
Society Islands. He was transferred to
Pearl Harbor,
Hawaii, in mid-June 1942 and assumed duty as commander,
Submarine Squadron 4. While in this capacity, he was responsible for the administration and training of three submarine divisions of total 15 submarines and for planning of their operations. The ships under his command had sink seventy-two ships totaling 394,752 tons and in damaging 54 ships totaling 374,449 tons during this period. He was an early advocate of
wolf packs and participated in the fifth patrol aboard his former submarine
Narwhal in the
Kurile Islands area from June to August 1943, becoming the oldest officer to make a war patrol during the war. For his service in this capacity, he was decorated with
Legion of Merit with
Combat "V". Following the tragic death of Rear Admiral
Robert H. English on January 21, 1943, Brown served as acting commander of the
Pacific Fleet submarine force for three weeks, before Rear Admiral
Charles A. Lockwood relieved him. He then resumed his command of Submarine Squadron 4 and remained in that command until November that year, when he was promoted to
rear admiral and appointed commander Training Command, Submarine Force,
Pacific Fleet. While in this capacity, Brown also established an intensive training program at Pearl Harbor, which included a Torpedo Data Computer school to improve proficiency in submarine fire control. He was further responsible for the study of enemy tactics and anti-submarine measures and the necessary development of attack doctrines, evasive tactics and counter anti-submarine measures to successfully cope with the intensified enemy activity. He also developed Submarine Lifeguard Exercises which enabled submarines of the force to successfully carry out missions of recovering numerous friendly aviators downed in enemy waters. He was decorated with
Navy Distinguished Service Medal for his service as commander Training Command, Submarine Force,
Pacific Fleet. Brown remained in that assignment until the end of April 1945, when he was transferred to North Pacific and assumed command of Cruiser Division One, a part of
North Pacific Force under Vice Admiral
Frank J. Fletcher. His command consisted of four old light cruisers, all with over twenty years of service, and Brown broke his flag aboard his former command
Richmond. Other ships were
Concord,
Trenton and
Detroit. His force conducted four anti-shipping sweeps in enemy waters and seven bombardments of enemy territory in the
Kuriles, inflicting considerable damage on the enemy and his shipping. Following the
surrender of Japan, Cruiser Division One participated in the occupation of Northern
Honshu and
Hokkaido,
Japan. Brown received his second
Legion of Merit with
Combat "V" for his service in the North Pacific. ==Postwar service==