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U.S. Dept. of State
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Over 50 Years of Defense Cooperation

Much in the U.S.-Japan security relationship has changed since the Mutual Defense Assistance Agreement (MDAA) between the United States of America and Japan was established 50 years ago, on March 8, 1954. However, many of the basic values and defense interests remain the same. The MDAA is the foundation of the security assistance program in Japan, and it focuses on promoting interoperability between the U.S. military and the Japan Self Defense Forces (JSDF).

Over the years, the original Joint Military Assistance Advisory Group - Japan (established in 1954) and its successor, the Mutual Defense Assistance Office - Japan (established in 1969) have recommended enhancements to the defensive capability of the JSDF, assisted with training and exercises, and introduced U.S. defense equipment and services to the Ministry of Defense (formerly known as the Japan Defense Agency). The U.S. and Japan share more major weapon systems than any other ally in the world, with current foreign military sales contracts valued at over $8 billion.

Defense technology cooperation is also an integral part of this vital security relationship and builds trust and teamwork between our two nations. Through a strong technological partnership, the defense establishments of Japan and the U.S. benefit from the advanced technical strengths of both countries while sharing the enormous costs and risks associated with developing and improving modern defense equipment.

To accomplish its mission, MDAO collaborates closely with Japan's Ministry of Defense, the JSDF, the Ministry of Foreign Affairs, the Ministry of Economy, Trade and Industry, and U.S. and Japanese defense industries. This strong working relationship, established over these past 50 years, is built upon mutual respect and trust and will continue to support the mutual defense of Japan.


Key Documents