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Military Intelligence: Counterintelligence: Basic Field Manual FM 30-25

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Military Intelligence: Counterintelligenc: Basic Field Manual FM 30-25
  • War Department, Washington, D.C., 15 February 1940
    • 38 pages
  • Paperback Edition
Surprise was highly important to the success of American forces in minimum time and with minimum loss. It was dependent not only upon rapidity of movement, but upon the efficiency and effectiveness of counterintelligence measures.


The object of this manual was to enumerate and clarify the various measures that could be adopted to destroy the effectiveness of the enemy intelligence system. These measures were either negative, designed to conceal the American forces' actual situation and intentions or to counteract injurious propaganda within American lines, or positive, designed to create in the mind of the enemy false conceptions of the American situation and intentions or capabilities.
  • Section I, General

    • Object

    • Responsibility

    • Counterintelligence measures

    • Counterintelligence plan

    • False information

  • Section II, Secrecy Discipline

    • General

    • Precautionary measures

  • Section III, Concealment

    • Use of cover

    • Use of darkness

    • Use of smoke

    • Use of camouflage

    • Camouflage discipline

    • Equipment

  • Section IV, Tactical Measures

    • General

    • Feints, demonstrations, and ruses

    • Defensive works and reserves

    • Change of routine

  • Section V, Preparation and Use of Documents

    • General

    • Classification of documents

    • Precautions at the front

    • Military correspondence

  • Section VI, Signal Communication Security

    • General

    • Definition

    • Responsibility

    • Compromise of signal communication security

    • Classification of messages

    • Cryptographic security

    • Safeguarding cryptographic equipment

    • Press releases

  • Section VII, Movements of Troops and Individuals

    • Marking of transportation and equipment

    • Precautions prior to departure

    • Movements of individuals

  • Section VIII, Newspaper Correspondents, Photographers, Radio News Commentators, and Visitors

    • Accredited public relations personnel

    • Special public relations personnel

    • Visitors

    • Registration

    • Visitor's agreement

  • Section IX, Censorship

    • General

    • Object

    • Responsibility

    • Application

    • Authorized channels for private communications

    • Suppression of information

    • Disposal of private diaries and memoranda

    • Correspondence with captured personnel

    • Communications to neutral or allied countries

    • Censorship stamps

    • Blue envelopes

    • Duties of censorship officers

    • Private correspondence of military personnel

    • Censorship of publications

    • Censorship of articles for publication

    • Photographic censorship

    • Telegraph, telephone, cable, radio, and broadcast censorship

    • Censorship of meteorological data

  • Section X, Counterpropaganda

    • Objects of counterpropaganda

    • Coordination with propaganda

    • Means employed by the enemy in spreading propaganda

    • Counterpropaganda measures

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