text: Army Aviation Operations
  Figure 3–16. Aviation assets conduct security in support of Stryker platoon movement
  * Aviation security forces cross the line of departure with the main body and conduct zone
  reconnaissance out to the LOA. This is used when the knowledge of the enemy and terrain are
  vague and trafficability is of greater concern to the protected force commander than reaction
  time to enemy contact (figure 3-17).
  Figure 3–17. Aviation assets conduct zone reconnaissance in support of a BCT main body
  movement
  3-98. The aviation security force commander controls the security operation by using a variety of control
  measures, to include: screen lines, subordinate unit boundaries, PLs, contact points, checkpoints, named
  areas of interest, fire support coordination measures, ACMs, observation posts (OPs) and routes. Such
  control measures allow for decentralized actions and small-unit initiative to the greatest extent possible.
  The security operation begins at the line of departure and the depth and reaction time provided by the
  security force is controlled by using an LOA. To the flank of a moving force or to the flanks or forward of a
  stationary force, the LOA is depicted as a screen line or a lateral unit boundary. When possible, all control
  measures are placed on recognizable terrain features. If a lateral unit boundary is the LOA and a friendly
  ground maneuver unit is operating to the flank, contact points are established to ensure contact is
  maintained with adjacent friendly units.
  3-99. To enable disciplined initiative in execution, the protected force commander provides engagement,
  battle handover and bypass criteria, the date-time group the security area must be established, the duration
  of the security mission, and the reaction time required to enable the main body the required early warning