Retired Army Maj. Gen. Lawrence C. Jaynes, 85 a veteran of both World Wars and the Korean conflict, died Monday at Bethesda naval Medical center.

At his retirement in 1953, he was special assistant to the chief of staff for reserve forces.

Gen. Jaynes had been assigned to that position at the outbreak of the Korean conflict. He overhauled the outmoded reserve system and was considered the man behind the Armed Forces Reserve Act of 1952.

During World War II, he set up a training program that funneled nearly 350,000 trained men into Mediterranean battle zones in 18 months.

Born in Portsmouth, Ohio, Gen, Jaynes entered the Army in 1918, and commanded a tank unit it France in World War I. Between World Wars he held various infantry and armored unit assignments.

At the outbreak of World War II, he was a member of the Operations and Plan Waer Department Generral Staff under then Col. Dwight D. Eisenhower. He later commanded the 13th Armored Division.

In 1944, he organized the North African Theater Replacement and Training Command and served in North Africa, Italy and southern France.

After the war, Gen. Jaynes was appointed president of the first Allied Military Tribunal to try Nazi war criminals. He held further commands in the Mediterranean theater.

After returning to this country in late 1947, he became commanding general of the New York, new Jersey and Delware Military District, where he pioneered the integration of the National Guard and Army Reserve forces into the Army structure.

Gen. Jaynes' decorations included the Distinguished Service Medal and Legion of Merit, both with Oak leaf clusters, and the Bronze Star. He also was decorated by the governments of Brazil, Great Britain, France and Italy.

After leaving military service, he became president of the National Trailways Bus system here, retiring in 1966.

He is survived by his wife, Frances, of the home in Summer, Md., a daughter, margaret Gail Lucas, of Houston, Tex., and five grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Army Emergency Relief Fund.