<P> The 1952 Mutual Security Assistance Pact provided the initial basis for the nation's security relations with the United States . The pact was replaced in 1960 by the Treaty of Mutual Cooperation and Security, which declares that both nations will maintain and develop their capacities to resist armed attack in common and that each recognizes that an armed attack on either one in territories administered by Japan will be considered dangerous to the safety of the other . The Agreed Minutes to the treaty specified that the Japanese government must be consulted prior to major changes in United States force deployment in Japan or to the use of Japanese bases for combat operations other than in defense of Japan itself . However, Japan was relieved by its constitutional prohibition of participating in external military operations from any obligation to defend the United States if it were attacked outside of Japanese territories . In 1990 the Japanese government expressed its intention to continue to rely on the treaty's arrangements to guarantee national security . </P> <P> The Agreed Minutes under Article 6 of the 1960 treaty contain a status - of - forces agreement on the stationing of United States forces in Japan, with specifics on the provision of facilities and areas for their use and on the administration of Japanese citizens employed in the facilities . Also covered are the limits of the two countries' jurisdictions over crimes committed in Japan by United States military personnel . </P> <P> The Mutual Security Assistance Pact of 1952 initially involved a military aid program that provided for Japan's acquisition of funds, matériel, and services for the nation's essential defense . Although Japan no longer received any aid from the United States by the 1960s, the agreement continued to serve as the basis for purchase and licensing agreements ensuring interoperability of the two nations' weapons and for the release of classified data to Japan, including both international intelligence reports and classified technical information . </P> <P> As of 2014 the United States had 50,000 troops in Japan, the headquarters of the US 7th Fleet and more than 10,000 Marines . In May 2014 it was revealed the United States was deploying two unarmed Global Hawk long - distance surveillance drones to Japan with the expectation they would engage in surveillance missions over China and North Korea . </P>

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