The Mutual Defense Assistance Act was a United States Act of Congress signed by President Harry S. Truman on 6 October 1949. For U.S. foreign policy, it was the first U.S. military foreign aid legislation of the Cold War era, and initially to Europe. The Act followed Truman's signing of the Economic Cooperation Act, on April 3, 1948, which provided non-military, economic reconstruction and development aid to Europe.
The Patton Tank family (here a Belgian M46) was the direct result of the revival of the late 1940s US armament modernization program framed by the MDAA