The US-Japan security arrangements have formed one of the most significant pillars of Japan’s security strategy ever since the end of the Second World War. However, what is noteworthy is the incremental growth in the Japanese profile within the alliance, from the time of its inception to the present. This paper traces the growing Japanese role within the alliance and argues that the relationship is likely to remain robust in the foreseeable future. Japan’s changing security policy as well as its augmented role within the parameters of the partnership has ensured that the alliance has made a marked shift from being asymmetrical to a mutually beneficial and reciprocal arrangement.