Maj. Gen. A. Lacy Tynes, 75, who served 35 years in the Army Medical Corps and was commanding general of Walter Reed Army Medical Center when he retired in 1965, died Tuesday at his home in Leesburg after a stroke.

Gen. Tynes was born in Augusta County, Va., and reared in Staunton. He earned a bachelor's degree at Hampton-Sydney College and graduated from the University of Virginia's medical school in 1930. He received his commission in the Medical Corps later that year.

During World War II, he served in the Pacific and as the Army's chief of hospital construction in the Office of the Army Surgeon General. He helped supervise the expansion of the Army's hospital facilities from those serving a small peacetime Army to a hospital system serving a huge force fighting a world war.

His postwar assignments included service as chief of the medical plans and operations division of the Surgeon General's Office from 1948 to 1951. He commanded Army hospitals in Fort Knox, Ky., Fort Dix, N.J., San Francisco, Hawaii and Japan. He was appointed commanding general of the Walter Reed Army Medical Center in Washington in 1962.

His decorations included the Distinguished Service Medal and the Legion of Merit.

Gen. Tynes, who had lived in Leesburg since 1965, was the administrator of the Loudoun Memorial Hospital there for five years before retiring a second time in 1970.

Survivors include his wife, Bessie Meade Tynes of Leesburg; two daughters, Anne Bellinger of Arlington and Margaret Gillespie of Vicksburg, Miss.; two sisters, Harriet Tynes and Margaret Fairley, both of Greensboro, N.C.; a brother, Finley Tyne of Ashleville, N.C., and two grandchildren.