島嶼防衛戰略的轉變：以自衛隊「水陸機動團」之組建為例

本研究嘗試以「島嶼防衛」這一概念切入，對自衛隊自2004年開始關注此一概念起至今，負責日本本土地面防衛任務的陸上自衛隊，在島嶼這一特殊卻涵蓋日本眾多國土範圍的地形下，其在「軟體（以防衛大綱為首的戰略設計）」、「硬體（根據戰略設計所進行的裝備與部隊建設）」兩大部分的演變歷程進行先期研究。並以現今「島嶼防衛」戰略的核心：2013年的《平成二十六年版防衛大綱》及2018年「水陸機動團」的成立做為整體評估之例。解析各階段在防衛戰略的考量意涵與演進、以及根據戰略而執行的部隊組建，並對其發展所蘊含的戰略內涵和優劣勢進行分析與探討，以了解島嶼防衛這一概念在自衛隊整體戰略中的發展源流。

This study examines the concept of“island defense”and its development within the Japan Ground Self-Defense Force (JGSDF), which has been responsible for Japan's territorial defense, from 2004—when the concept first gained attention—until the present. Focusing on the unique yet geographically extensive island terrain of Japan, this research explores the evolution of both the“software”(strategic designs such as the National Defense Program Guidelines) and“hardware”(force and equipment development based on these strategies). The study uses two key milestones as examples for comprehensive evaluation: the 2013 National Defense Program Guidelines and the establishment of the Amphibious Rapid Deployment Brigade in 2018, which represent the core of the current island defense strategy. By analyzing the strategic considerations, evolutionary processes, and force structure implementation across various stages, this research identifies the strategic significance, strengths, and weaknesses of these developments. Ultimately, it aims to clarify the origins and progression of the island defense concept within the overall strategy of the JSDF.