During WWII Sard worked as a member, under the auspices of the Applied Mathematics Panel, of the Applied Mathematics Group of Columbia University (AMG-C), especially in support of fire control for machine guns mounted on bombers. Saunders Mac Lane wrote concerning Sard: “His judicious judgments kept AMG-C on a straight course, […]”.Saunders Mac Lane: Requiem for the Skillful. In: Notices of the American Mathematical Society. Vol. 44, No. 2, 1997, , pp. 207–208 (PDF; 43 kB).
