Mutual Defense Assistance Act

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 (the Marshall Plan), on April 3, 1948, which provided non-military, economic reconstruction and development aid to Europe.

The 1949 Act was amended and reauthorized on July 26, 1950. In 1951, the Economic Cooperation Act and Mutual Defense Assistance Act were succeeded by the Mutual Security Act, and its newly created independent agency, the Mutual Security Administration, to supervise all foreign aid programs, including both military assistance programs and non-military, economic assistance programs that bolstered the defense capability of U.S. allies.

About the same time, the Mutual Defense Assistance Control Act of 1951, also known or referred to as the Battle Act, (65 Stat. 644; 22 U.S.C. 1611 et seq.) was also passed; it banned U.S. assistance to countries doing business with the Soviet Union and was so-named after its sponsor, Representative Laurie C. Battle of Alabama. Strong motivation for this 'control' act also came from export control concerns, following their tightening by the Export Control Act of 1949 over Soviet advances; export controls were used for both domestic policy and later as an instrument of foreign policy. This is exemplified by the restrictions on export of certain strategic or military items to the Soviet bloc or to other countries which it felt, if permitted, would be detrimental to the foreign policy program of the U.S. This latter motive became so strong that it brought legislation directing the President to enlist the cooperation of other nations in enacting controls on trade with the Soviet block to parallel those of the United States. The benefits of the various economic and military aid programs were to be withheld from non-cooperating nations. The act covered a wide range of materials needed for the production of weapons, and was especially focused on anything that could aid atomic weapons research and construction.

As the Cold War developed, these acts were part of the American policy of containment of communism. They importantly provided defense assistance to any ally that might be attacked by the Soviet Union or one of its allies, while other programs provided non-military economic assistance. In Asia, the programs expanded with the newly established Maoist People's Republic of China, and other areas, with the development of specific country missions, including ones in Austria (1947–1950), China (1946–1948), Ireland (1948–1951), and Trieste (1947–1952).