The US-Japan Security Alliance is a mutual defense agreement between the United States and Japan, established in 1960. It aims to ensure the security of both nations through military cooperation and support. The alliance allows the US to maintain military bases in Japan, which enhances regional stability and deters potential threats. Under this alliance, both countries engage in joint military exercises and share intelligence. The US commits to defending Japan in case of an armed attack, while Japan provides logistical support and hosts American forces. This partnership plays a crucial role in maintaining peace in the Asia-Pacific region.