1. Any break or breach in the continuity of tactical disposition greater in size than an area which could be covered effectively by small arms fire. (AFPM 3-8-1, PAM 3-041, PAM 3-0601-02) 2. A portion of a minefield of specified width, in which no mines have been laid, to enable a friendly force to pass through the minefield in tactical formation. (PAM 3-041)

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