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The United States Marine Corps's Amphibious Reconnaissance Battalion, formerly ''Company'', was a specialized team of Marines and Navy Corpsmen that performed clandestine preliminary pre–D-Day amphibious reconnaissance of planned beachheads and their littoral area within uncharted enemy territory for the joint-Navy/Marine force commanders of the Pacific Fleet during World War II. Often accompanied by Navy Underwater Demolition Teams and the early division recon companies, these amphib recon platoons performed more reconnaissance missions (over 150) than any other single recon unit during the Pacific campaigns.〔Bruce F. Meyers, ''Swift, Silent, and Deadly: Marine Amphibious Reconnaissance in the Pacific, 1942–1945,'' (Annapolis, MD: Naval Institute Press, 2004).〕 They are amongst the patriarch lineage of the Force Reconnaissance companies which still continue providing force-level reconnaissance for the latter Fleet Marine Force. Their countless efforts have contributed to the success of the joint-Marines/Army maritime landing forces assigned under the Navy fleet commanders during the island-hopping campaigns of the numerous atolls in the Pacific. Their trademark of amphibious techniques utilized insertion methods under the cover of darkness by rubber boats, patrol torpedo boats, Catalina flying boats, converted high speed destroyer transport ships, or APDs, and submarines for troop transports.〔Chief of Naval Operations, ''Dictionary of American Fighting Ships,'' Vols 1–7 (Washington, D.C.: GPO, 1968).〕 These Marines applied skills in topographic and hydrographic surveys by charting and measuring water depths, submerged coral heads, and terrain inland; taking photographs and soil samples for permeability for amphibious tractors and landing craft parties. Their assignments included scouting or reconnoitering a planned, or potential landing site, and intelligence-gathering missions. These teams also evaluated the beaches looking for exits off the hostile beaches inland, for contingency measures if the Marine landing force were to necessitate a retreat. Most importantly, they compromised the locations of enemy forces, their strengths and weakness, and other importance in the follow-up of an amphibious assault. ==Early history== The United States' earliest doctrine in amphibious reconnaissance was introduced by Major Dion Williams, who divided amphibious reconnaissance between those concerned with the sea to the shoreline to be conducted by the Underwater Demolition Teams, and those concerned with the beach and adjacent land, the recon Marines. Technical expertise was required in surveying, mapping, and recording observations, as well the ability to interpret various types of topological data from previous surveys. He stated— :"In order to prepare intelligent plans for the attack or defense of a harbor or bay, it is necessary to have at hand a comprehensive description of the hydrographic features and accurate charts showing the depths of water at all points, the reefs, rocks, shoals, and peculiar currents which constitute dangers to navigation, and the tributary streams and channels which may form avenues of attack or furnish anchorages for a portion of the floating defenses or auxiliaries of the defenders."〔Dion Williams, USMC, ''Naval Reconnaissance, Instructions for the Reconnaissance of Bays, Harbors and Adjacent Country,'' (Wash, D.C.: GPO (1906).〕 American naval doctrine of 1927 continued to emphasize reconnaissance for planning as well as reconnaissance to verify the soundness of formulated plans and reconnaissance during the last phases.〔The Joint Board, ''Joint Action of the Army and the Navy,'' F.T.P. 155 dtd 1927, (Wash, D.C.: GPO, 1936).〕 This three-stage concept of intelligence gathering remained in effect throughout World War II when the V Amphibious Corps directive listed the following phases of reconnaissance:〔 #Prior to the completion of operation plans for landing, information is sought for preparation of plans in sufficient time prior to the operation to avoid the loss of secrecy which may be incurred by reconnaissance executed shortly prior to an attack. #Between completion of plans for the landing and the actual embarkation of a landing force, further information necessary for the execution of the plan is collected such as late data on the enemy's strength arid dispositions. #During the last days prior to Zero-D-Day or further information is sought of the enemy's dispositions and strength as well as movement of his reserves.〔V Amphibious Corps, ''Corps Training Memorandum Number 26-44, Reconnaissance in Amphibious Operations,'' dtd March 28, 1944; HistDiv, HQMC, Archives 62A-2086, Carton 20, File "Reconnaissance."〕 Early reconnaissance activities were generally confined to surveys of various ports, uncharted islands and contiguous waters performed by officers qualified in survey technique. Some nautical charts to this date of infrequently encountered areas and islands still bear annotations indicating they were compiled by officers of various American ships. The duty of an intelligence officer aboard American ships was usually filled by the senior Marine Corps officer aboard.〔 The most profound war prophet that lived was perhaps Lt. Colonel Earl H. Ellis. Ellis was a United States Marine Corps Intelligence Officer, and author of ''Operations Plan 712: Advanced Base Operations in Micronesia'', which became the basis for the American campaign of amphibious assault that defeated the Japanese in World War II. Ellis' prophetic study helped establish his reputation among the forefront of naval theorists and strategists of the era in amphibious warfare, foreseeing the eminent attack from Japan leading to the island-hopping campaigns in Central Pacific twenty years before the United States entered World War II. He is sometimes credited in being the 'first' recon Marine in the United States due to a secretive spy mission in the Pacific, reporting the build-up of Japanese naval forces. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「United States Marine Corps Amphibious Reconnaissance Battalion」の詳細全文を読む スポンサード リンク
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