PRESENTS PORTRAIT: Michigan Supreme Court Chief Justice John R. Dethmers (left) presented portrait of Secretary of the Army Wilber M. Brucker to the University Law School at ceremonies here yesterday. Secretary Brucker (right), who received his bachelor of laws degree from the U-M in 1916, and Mrs. Brucker look on. The portrait was painted by Roy Gamble, a Detroit artist. Brucker served as Saginaw county prosecuting attorney, 1923-1926; Michigan's attorney general from 1928-30; governor from 1931-32; and was named secretary of the Army in 1955.