text: Chapter 13
  Figure 13-10. Stationary flank guard
  13-90. When conducting a moving flank guard, units address additional considerations beyond those
  applying to a moving flank screen. Instead of occupying a series of observation posts, the security force plans
  a series of BPs. Figure 13-11 depicts example control measures for a moving flank guard. The security force
  monitors potential enemy avenues of approach for as long as the enemy threatens the main body. Once the
  flank guard makes contact with enemy forces, it can attack, defend to defeat, or fix enemy ground forces in
  their current positions before they can engage the friendly main body or conduct a delay as the situation
  requires.
  13-91. The lead element of a moving flank guard performs three tasks. It maintains contact with the
  protected force’s main body, reconnoiters the area between that main body and the flank guard’s routes of
  advance, and reconnoiters the flank guard’s route. It performs these tasks by conducting a zone
  reconnaissance.