text: Security Operations
  Figure 5-3. IBCT Cavalry squadron stationary flank guard
  Moving Flank Guard
  5-70. Units must consider many factors for the organization security force of a moving flank guard, which
  is similar to organizing an advance guard. The BCT establishes conditions for reconnaissance and security
  operations by enabling the security force with aviation support, joint and organic fires, and additional
  intelligence collection. This may include partnering with and access to joint and national-level intelligence
  assets (see paragraph 3-91, page 3-20). The security force commander designates roles to each subordinate
  unit, in coordination with the protected force commander. For example, if a Cavalry squadron is tasked to
  provide a moving flank guard for a BCT, the security force commander is the squadron commander and the
  protected force commander is the BCT commander. The moving flank guard maintains a large enough
  interval from the protected force and protects the main body within the protected force commander’s intent.
  5-71. As part of the planning and execution phase, the security force commander decides on one of the two
  methods of execution. These methods are based on how the main body crosses the LD. The security force
  should not make its own penetration of the line of contact when facing prepared enemy defenses. To do so
  may prevent or significantly delay the security force in the assumption of the flank guard.
  5-72. In the first method, the security force crosses the LD separately from the main body and deploys to
  perform the mission. This method keeps the two forces from interfering with one another and is faster. This
  method is appropriate when another force has penetrated the line of contact or the main body is not in contact
  with the enemy.