text: Chapter 13
  than in the first method, the LD is uncontested, and the IPB process estimates possible enemy contact. It is
  slower than the previous technique but provides better security.
  Figure 13-2. Example of the security force crossing separately and the lead element
  conducting a movement to contact
  With the Main Body and Conducts a Zone Reconnaissance out to the Limit of the Security Area
  13-49. Finally, in the third technique, the security force crosses the LD with the main body and conducts a
  zone reconnaissance out to the far limit of the security area. This technique is appropriate when the LD is
  also the line of contact, the main body makes its own penetration of the enemy defenses along the line of
  contact, the main body is moving slowly, and leaders do not clearly understand the enemy situation. The
  security force may follow the lead element of the main body through the gap and deploy when the situation
  permits. This technique provides increased security for both the security force and the main body; it is also
  the most time consuming. Figure 13-3 depicts this third technique.