U.S.–Japan alliance
The U.S.–Japan alliance (日米同盟, Nichi-Bei Dōmei) is a military alliance between Japan and the United States, as codified in the Treaty of Mutual Cooperation and Security between the United States and Japan, which was first signed in 1951, took effect in 1952, and was amended in 1960. The alliance has been further codified in a series of "administrative" agreements, "status of forces" agreements, and secret pacts (Japanese: 密約, romanized: mitsuyaku) that have not been subject to legislative review in either country.