Retired Army Maj. Gen. Leven C. Allen, 85, a veteran of both world wars and the Korean conflict and chief of staff of Gen. Omar Bradley's 12th Army Group in Europe during World War II, died of a heart ailment Thursday at Walter Reed Army Hospital.

He served with the 13th Machine Gun Battalion during World War I and was awarded the Purple Heart after being wounded at the front at Frapelle, France, on Aug. 16, 1918.

Following that war, Gen. Allen was appointed an instructor at the Infantry School at Fort Benning, Ga. He graduated from the Command and General Staff School and the Army War College in the 1930s, and was serving in the War Plans Division of the old War Department general staff at the outbreak of World War II.

Prior to joining the 12th Army Group, he was commandant of the Infantry School at Fort Benning from 1942 to 1943. He received the Distinguished Service Medal with palms for his World War II service.

In 1946 he became president of the old War Department Manpower Board and later was executive secretary to the Secretary of Defense before becoming chief of staff of the 8th Army in Korea during the conflict there. He retired on physical disability in 1951.

Gen. Allen was born at Fort Douglas, Utah, and attended the University of San Francisco before beginning a 35-year Army career when he accepted a commission as a second lieutenant in 1916.

He was a member of the Army-Navy and Chevy Chase clubs.

Survivors include his wife, Helen Townsley Allen, of the home in Washington; a daughter, Mrs. William Browne of Baltimore, and two grandchildren.