Finding Aid to the

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					       Finding Aid to the
Naval Security Group Command
      Headquarters fonds
            (80/206)
  Prepared and revised 4 January 2002
          By Warren Sinclair
                                              Table of Contents
Scope and Content.................................................................................................................... 3
Administrative History ............................................................................................................. 3

Volume I: Allied Communication Intelligence and the Battle of the Atlantic ......................... 4
Volume II: U-Boat Operations ................................................................................................. 4
Volume III: German Naval Communications Intelligence ...................................................... 6
Volume IV: Technical Intelligence from Allied C.I ................................................................ 6




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Naval Security Group Command Headquarters fonds. – 1 microfilm
reel; 35 mm. – Microfilmed 1977 (originally created 1942-1945)

Scope and Content
Fonds consists of intelligence reports on the War in the Atlantic during the Second World War.
The reports are the account of the War in the Atlantic from December 1942 to May 1945 as seen
through and influenced by decryption of German radio traffic. Includes the following four
volumes: Allied Communication Intelligence and the Battle of the Atlantic; U-boat operations;
German Naval Communications Intelligence; and technical intelligence from Allied
Communication Intelligence.


Administrative History
The Naval Security Group Command was activated on 1 July 1968 as an echelon 2 command
under a commander reporting directly to the Chief of Naval Operations (CNO). Simultaneously,
the Headquarters, Naval Security Group Command was established and assigned to the CNO for
command and support. Concurrently, the CNO delegated command and support responsibility for
the Naval Security Group Command Headquarters and assigned shore activities to the
Commander, Naval Security Group Command. The Naval Security Group Command comprises
the Headquarters and assigned shore activities. The Commander, Naval Security Group
Command has been designated the Technical Manager of the Naval Reserve Security Group
(NAVRESSECGRU) Program by the CNO. The Naval Security Group Command is assigned
Department of the Navy-wide responsibilities for cryptology. It provides technical guidance and
support to cryptologic activities of the Navy operating forces. The Command advises and assists
the CNO and Fleet Commanders in Chief in the planning and programming of cryptologic and
related resources and the effective use thereof.




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Volume I: Allied Communication Intelligence and the Battle of the
Atlantic
                                     Subject                                                 Page
Table of Contents                                                                    1
Description of Program                                                               2
Chapter I: Brief Review of War in Atlantic Up To Reading of U-Boat Traffic in        8
Dec 1942
Chapter II: U-Boat and Allied naval Communication Intelligence (including nature     15
of U/B’s mission, strengths and weaknesses)
GRAPH: M/V Tonnage Sunk In Escorted Convoys By U-Boats (Aug 1941 –                   29-30
March 1945
Chapter III: Winter-Spring of 1943 U/B Offensive and Defeat (including “Defeat or    32
Strategic Withdrawal”, W II losses compared with WW I, air attacks, and refusal to
admit defeat)
GRAPH: Monthly Loss British, Allied, and Neutral Shipping By U/B Action              52-53
Chapter IV: U-Boat Restoratives (including course of the war in summer of 1943,      56
renewal of North Atlantic Battle, “Thoughts On Convoy Fighting”, new weapons
and tactics)
Chapter V: The New U-Boat Fleet and Schnorchel (including Allied Invasion of         71
France, Schnorchel Fleet, weaknesses, and surrender)
Chapter VI: Compromise of Allied Codes by German Intelligence                        79
APPENDIX I to Vol. I, listing the graphs on the six pages following                  92
GRAPHS:                                                                              Following
 U-Boat Operations (Jan 1943 – April 1945)                                          page 92
 U-Boat Losses (Jan 1943 – April 1945)
 M/V Tonnage Sunk by Subs in Atlantic (Jan 1943 – May 1945)
 Subs in Groups, Independent, Special Operations, Returning and Outbound
    (Jan 1943 – May 1945)
 Percentage Subs in Groups and Independent (Jan 1943 – May 1945)
 New Subs Entering Atlantic Operations, Subs Sunk, Gain or Loss to Atlantic
    U/B Operational Fleet (Jan 1943 – June 1944)
Letter of Transfer of Historical Material, from Dept. of Navy, Naval Security        Following
Group Command Headquarters                                                           page 92
List of Abbreviations                                                                Following
                                                                                     page 92


Volume II: U-Boat Operations
                                      Subject                                                Page
Table of Contents                                                                        1

PART A: U-Boat Offensive Against Convoys, Dec 1942 – May 1943                            2
Chapter I: The Opening of the Convoy Battle (including general situation as seen         3
through U/B Traffic of early Dec)
Chapter II: Transition, Jan – Feb 1943                                                   15
TWO GRAPHS re ocean routes and attacks                                                   30-31
Chapter III: Crisis of North Atlantic Offensive, March 1943                              31


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                                       Subject                                                Page
TWO GRAPHS re ocean routes and attacks                                                      52-53
Chapter IV: Defeat in the North Atlantic (including Adm. Doenitz’s admission of             53
defeat and explanation: radar or Allied wiles and technical innovations)
CHART: Total Subs at Sea, Jan – Sept 1943                                                   79
APPENDIX A: Description of convoy and U/B Movements, dates and E- or W-                     79-80
Bound (18 pages)
APPENDIX B: U/B Group Operation Against U.S. and British Convoys Bound To                   80
or From N. Africa, Nov 1942 – April 1943
APPENZIX C: Distant Patrol Areas (Ships Sunk), Refueling, and Special Tasks, Jan-           87-88
May 1943 (5 pages)
APPENDIX C1 to Part A: Distant Patrol Areas, Jan-May 1943                                   88
APPENDIX C2 to Part A: Refuelings, Jan-May 1943                                             92
APPENDIX C3 to Part A: Special Tasks (Miscellaneous), Jan-May 1943                          95

PART B: U-Boat Defensive and U.S. Anti-Sub Activities, May 1943 – May 1944                  99
Chapter V: Shift to the Middle and South Atlantic (including withdrawal from N.             100
Atlantic, review of causes of German loss of the initiative, and vulnerable points)
GRAPH re ocean routes and attacks                                                           110-111
Chapter VI: Growth, Significance, and Decline of U/B Refueling Fleet (including             111
TABLES: U/B refueling fleet monthly additions and losses, p. 113, and U/B refuelers
by series, p. 119)
Chapter VII: U.S. A/S CVE Task Groups (including the attack on Manseck, sinking             131
of Czygan, and refueler losses in July and August 1943)
Chapter VIII: Independent Patrols in Distant Areas, Summer 1943 (including A/C              160
with radar everywhere, U/B reaction, and recommendation for U/B’s)
APPENDIX to Chapter VIII: Distant Patrol Areas (Ships Sunk), Refuelings, and                166-167
Special Tasks, June 1943 – Sept 1943 (5 pages)

PART C: Resumption of Offensive Against Major Convoys, Sept 1943 – March                    167
1944
Chapter IX: U/B’s Defeat Made Emphatic                                                      168
Chapter X: Last Challenge of the Pro-Schnorchel U/B (including appearance of                176
weather boats and net results of renewed offensive)
CHART: Total Subs at Sea, Oct 1943 – May 1944                                               186
APPENDIX A to Part C: North Atlantic Convoys and U/B Groups, Sept 1943 –                    186-187
March 1944, and England-Gilbralter Convoys and U/B Groups, Oct 1943 – Jan 1944
(13 pages)
APPENDIX B to Part C: Independent Patrols in Distant Areas, Oct 1943 – May 1944             187

PART D: From the Invasion of France to the End of the War                                   188
Chapter XI: The U/B and the Allied Invasion of France (including U/B Fleet’s not            189
being suited for defensive mission, pre-invasion scrutiny of traffic, reaction to Jan 29,
1944 invasion scare, D-Day, breakdown of German land communications,
destruction of Bordeaux, and withdrawal to Norway
APPENDIX to Chapter XI: The U/B and the Allied Invasion of France, statistics               212
Chapter XII: New Challenge (including effort to regain initiative, threat of new types      213
of U/B’s, attempts to blockade England, and collapse in the homeland)
GRAPH: Weather Transmissions and the German Counterattack                                   229-230
APPENDIX to Chapter XII: U/B’s Sunk                                                         238


                                                  5
                                        Subject                                                Page

PART E: Blockade Runners: Surface and Submarines, and German Naval
Operations in the Far East and Indian Ocean                                                  302
Chapter XIII: Surface Blockade Runners                                                       303
CHART: Blockade Running Ships 1942-1945, and Surface Ships used to Refuel                    347
U/B’s in Indian Ocean 1943-1944
CHARTS: Blockade Running Ships Between Europe and Far East 1942-1945 (6                      347-348
pages)
Chapter XIV: U-Boat Operations in the Indian Ocean and the Far East (including               348
organization and background, lack of Japanese cooperation, Blockade-Running Subs,
and U/B Chronology)
APPENDIX A to Chapter XIV: U/B cruises attempted, completed, sinkings,                       Followin
captures, German subs given to Japan, ex-Italian subs (15 pages)                             g Page
                                                                                             384
APPENDIX I to Vol. II: U/B’s Sunk By U.S. Forces with Aid of Radio Intelligence,             Followin
and CHARTS of where sunk (7 pages)                                                           g Page
                                                                                             384



Volume III: German Naval Communications Intelligence
                                         Subject                                                Page
Table of Contents                                                                              1
Chapter I: Organization and Working of German Naval Communications Intelligence                2
Chapter II: Intelligence Disseminated to U/B’s and Sources Acknowledged in U/B                 12
Traffic (including course of war as reflected in intelligence sent to U/B’s at sea, aerial
reconnaissance, agents, and P.O.W.’s)
Chapter III: German Intelligence of Allied Convoys in Atlantic                                 24
Chapter IV: Omitted
Chapter V: “B-Dienst” On Board U-Boats                                                         89
Chapter VI: Omitted
Chapter VII: German Fears of the Compromise of Their Naval Cipher                              129



Volume IV: Technical Intelligence from Allied C.I.
                                           Subject                                              Page
Table of Contents                                                                              1
Chapter I: German Search Receivers and Radar (including the “Magic-Eye”, the                   2
radiation specter, and the first non-radiating receivers)
Chapter II: Anti-Detection Devices                                                             19
Chapter III: Schnorchel                                                                        28
Chapter IV: Armament (Torpedoes and A/A Guns)                                                  35
Chapter V: German-Japanese Exchange of Information                                             49
Chapter VI: Fuel                                                                               57
Chapter VII: U-Boat Navigation                                                                 62


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                                      Subject                                         Page
APPENDIX to Vol. IV: German Weather Reporting Activities Jan 1944 – May 1945         94
CHART: Shore Stations, Locations, Attacks On Stations, Dates Destroyed and Remarks   101




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