Retired Col. John C. MacArthur, 90, a decorated veteran of both World Wars who spent much of his career with the Army Chemical Corps, died at the Sleepy Hollow nursing home in Annandale on Oct. 26 after a stroke. He lived in Washington.

Col. MacArthur began his Army career during World War I, in which he served in France. He was an assistant military attache in London from 1928 to 1932 and later taught at the Command and General Staff College.

In World War II, he was a chemical warfare officer in Europe on the 12th Army Group staff of Gen. Omar N. Bradley. He was chief of plans, training and intelligence of the Chemical Corps when he retired in 1951.

He then spent seven years as editor of the Armed Forces Chemical Journal, a professional publication.

Col. MacArthur's decorations included the Legion of Merit and the Bronze Star Medal.

He was born in Illinois and earned a degree in journalism from the University of Missouri. He worked for a newspaper in Omaha, Neb., before beginning his Army career.

Col. MacArthur was a member of the Armed Forces Chemical Association, the Army & Navy Club, the Civil War Roundtable and the St. Andrews Society. He was a member of the Caleb Butler Masonic Lodge.

His wife, the former Marguerite Riesen, died in 1976.

Survivors include two sons, John C., II, of Annandale, and Malcolm D., of Bethesda, and six grandchildren.