United States Army in World War II: The Western Hemisphere

Guarding the United States and Its Outposts

by Stetson Conn, Rose C. Engelman, and Byron Fairchild

. . . to Those Who Served

Contents

Foreword

The Authors

Preface

Chapter 1: The Framework of Hemisphere Defense

Chapter 2: The Command of Continental Defense Forces

Peacetime and Planned Wartime Organization—Reorganization, July 1940–December 1941—The Wartime Organization

Chapter 3: Preparations for Continental Defense

Harbor Defenses—Air Defense Preparations—The Army and Civilian Defense—Guarding Non-military Installations

Chapter 4: The Continental Defense Commands After Pearl Harbor

Defense Measures on the West Coast, 1941–42—Defense Measures on the East and Gulf Coasts, 1941–42—Guarding the Sault Ste. Marie Canal—The Period of Reduction, 1942–45

Chapter 5: Japanese Evacuation From the West Coast

The Background of Evacuation Planning—The Decision for Mass Evacuation—The Evacuation of the Japanese

Chapter 6: The Reinforcement of Oahu

The Hawaiian Department Before 1941—Defense Preparations During 1941

Chapter 7: The Pearl Harbor Attack

The Approach to War—The Plan and Launching of the Attack—The Attack and the Response—Investigation and Judgment

Chapter 8: The Hawaiian Defenses After Pearl Harbor

The Impact of War—The Question of Japanese Evacuation—Reinforcement—Midway

Chapter 9: The Garrisoning of Alaska, 1939-41

Initial Army Plans and Preparations—The Alaska Defense Command—Making Ready To Defend the Navy’s Bases—The Air Defense Problems—Airfields, Radar, and the Construction Program—Reinforcing the Air Defenses—On the Alert

Chapter 10: Alaska in the War, 1942

Reinforcement—The Attack on the Aleutians—The Army’s Reaction—Command Problems—Aid to the Soviet Union—The Advance Westward

Chapter 11: Clearing the Aleutians

Attu Retaken—Kiska—Grand Anticlimax

Chapter 12: Forging the Defenses of the Canal

The Prewar Defenses—Emergency measures, August 1939–January 1940—Reorganization and Expansion—The Puerto Rican Outpost, 1939–40—The Alert of June 1940

Chapter 13: Out From the Canal Zone

Organizing the Caribbean Theater—The Alert of July 1941—The Outposts in the Dutch West Indies—Securing the Pacific Approaches—Expansion in the Republic of Panama—Strength and Readiness of the Defenses, 1941—Naval Factors in Area defense

Chapter 14: The New Bases Acquired for Old Destroyers

The Local Setting—Planning the Garrisons—Negotiating the Base Agreement—Launching the Construction Program

Chapter 15: Manning and Organizing the New Atlantic Bases

The Garrisons and Their Mission—Problems of Organization and Command—Early Administrative Problems

Chapter 16: The Caribbean in Wartime

The First Effects of War—Shaping the Local Commands—The First Blow—The Watch on the Canal—The War Against the U-Boat—Passing the Peak

Chapter 17: Greenland: Arctic Outpost

Growth of American Interest in Greenland—Greenland’s Strategic Importance Reappraised—Establishing the BLUIE Bases—The Defense of Greenland

Chapter 18: Planning the Iceland Operation

The Shifting Focus of American Interest—The President’s Decision and the War Department’s Response—Problems, Remote and Immediate—INDIGO Planning, First Phase—A New Decision: Reinforcement, Not Relief—The First American forces Land in Iceland—INDIGO Planning, Second Phase—A Backward Glance at the INDIGO Planning

Chapter 19: Establishing the Iceland Base Command

The Movement of the Second Echelon, Task Force 4—Problems of Defense; Ground and Air—Problems of Administration and Human Relations—The Question of Reinforcements and Relief—A New Role—Basic Considerations for Determining the Post-Pearl Harbor Course of Action

Chapter 20: The North Atlantic Bases in Wartime

The Build-up—The Command Problem—Operations Against the Enemy

Bibliographical Note

Index

Tables

1: Recommended and Approved Strengths for Atlantic Bases, 1940–41

2: Estimated Cost of Army and Air Bases, 1940

3: Estimated Cost of Army and Air Bases, 1941

4: Actual Cost of Army and Air Bases

5: Shipping Losses in the Caribbean Area, January 1942–July 1944

Chart

1: Organization Approved 3 May 1941

Maps

I: Continental Defense Organization, 20 May 1942

II: Oahu Island

III: The Capture of Attu, 7th Infantry Division, 11–30 May 1943

IV: Iceland

Illustrations

Lt. Gen. Hugh A. Drum—Lt. Gen. John L. DeWitt—Six-Inch Gun Emplacement on Jasper Parapet—Mayor La Guardia in Action During Practice Alert—Camouflaged Airplane Factory—Camouflaged Airplane Factory—Infantrymen on Beach Patrol—Japanese Free Balloon—Japanese Evacuees Arrive at the Colorado River Relocation Center—Troop Maneuvers in Hawaii—Troop Maneuvers in Hawaii—Wheeler Field After the Bombing—Japanese Children Drilling—View of Dutch Harbor—Naval Base at Kodiak—Construction on Adak—Construction on Adak—Attu Landings—Attu Landings—Enemy Radar Installation—Panama Airfields—Panama Airfields—Antiaircraft Defenses of the Panama Canal—Antiaircraft Defenses of the Panama Canal—U.S. Army Installations in the Bermuda Islands—U.S. Army Installations in the Bermuda Islands—The Edmund B. Alexander—First Troops in Trinidad—First Troops in Trinidad—Installations in Newfoundland—Installations in Newfoundland—Optical Height Finder Mounted on Old El Morro Fortress—Torpedoed Vessel Being Towed Into San Juan Harbor—Coast Guard Tug Aiding Freighter Off Greenland—Abandoned German Equipment in Greenland—Temporary Supply Dump in Reykjavik—Maj. Gen. Charles H. Bonesteel—Gale in Iceland—Army Posts in Iceland—Army Posts in Iceland—U.S. Army Troops Arriving in Reykjavik, January 1942—Section of a Greenland Airfield, 1943—American Fighter Planes Over Camp Artun, Iceland—German Prisoners Under Guard in Greenland

All but three of the illustrations are from Department of Defense files. The photographs on page 69 is used by courtesy of the New York Daily News. The two photographs on page 90 were furnished by The Boeing Company.