Sellers was promoted to rear admiral in 1927 and served as Commander, Special Service Squadron during the Nicaraguan Uprising. Following his service with the squadron he served as Judge Advocate General of the Navy from 1929 until 1931. Then Commander, Battleship Division One from 1931–1932. In 1932 he was promoted to vice admiral and was assigned as Commander, Battleships Battle Force, United States Fleet. He was promoted to Admiral on June 10, 1933, and assigned as Commander-in-Chief United States Fleet and continued to serve until June 18, 1934. In 1934 he was reassigned as Superintendent of the U.S. Naval Academy and served in this capacity until his retirement.