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 US 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 US. 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 (1947–50), China (1946–48), Ireland (1948–51), and Trieste (1947–52).
Historical background : the World War II aftermath and the Cold War.
In the euphoria of the end of World War II, western arsenals dropped down to a dangerous level of weakness and being worn-out. Public funds were, by priority, allocated to reconstruction. Even the US arsenal showed obvious signs of shortages and decay.
Military officials began calling for the introduction of a new defense legislation in 1947, arguing that depleted inventories of surplus World War II-vintage armaments, piecemeal planning of new armaments and restrictions on presidential authority threatened current and future efforts to arm allied nations. New legislation became a necessity by mid-1948 with the negotiation of the North Atlantic Treaty and the necessity to provide military aid to strengthen the connectional defenses, having in mind a global resistance to Communist expansion of the signatories.
Truman sent a first bill to Congress on 25 July 1949, the day he ratified the North Atlantic Treaty but congressional opposition forced submission of a new legislation, which specified the recipients and the amounts of assistance. Administration planners believed the MDAA's immediate effects would be to raise the morale of friendly nations and prove US reliability and resolve to meet Communist worldwide threats. The MDAA also institutionalized the concept of specific military aid programs, a result ensured by adoption of similar legislation in 1950 and an increase in annual spending on military aid to $5.222 billion after the outbreak of the Korean War - the very first large scale test of the validity and practicability of the concept, if excepting the logistical support allowed to France during the Indochina War.
Mutual Assistance Program.
The Mutual Defense Assistance Act created the "Mutual Assistance Program," which became an integral component in the federal government's policy of containment of Soviet expansion. This program differed from the World War II-era Lend-Lease program in that it never needed refunding from the country that benefits any military assistance. Between 1950 and 1967, $33.4 billion in arms and services and $3.3 billion worth of surplus weaponry were provided under the program.
Europe: NATO.
On 4 April 1949, the foreign ministers from 12 countries signed the North Atlantic Treaty at the Departmental Auditorium in Washington D.C.: Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom and the United States. Provision for enlargement was however given by Article 10 of the North Atlantic Treaty, which states that membership is open to any "European State in a position to further the principles of this Treaty and to contribute to the security of the North Atlantic area".
Non aligned countries.
The MDAA caused both a great deal of friction with the non-aligned countries and opportunities to tighten geopolitical relations with the western free world and especially the United States.
Controversy.
After disagreements with General Charles de Gaulle regarding the US leadership role within the NATO Alliance and following the support given by successive US Governments to right-wing military regimes in accordance with the stated Communist Containment policy - such as the Spain's Francoist State and Portugal's New Order or the Greek Regime of the Colonels, in the wake of the Vietnam War protests, left-wing public opinion in the US and in Europe raised the question of the MAPs being used as instruments of some form of "political US imperialism". 