text: Chapter 2
  of time and the short distance involved in many infiltration operations may make conducting formal linkup
  procedures unnecessary.
  Preparing an Infiltration
  2-98. Once the objective, infiltration lanes, and linkup or rally points are selected, commanders’ direct
  information collection operations to update and confirm intelligence requirements. Friendly information
  collection operations identify enemy sensors and surveillance systems. Units then revise the plan to reflect
  current conditions in the assigned area.
  Executing an Infiltration
  2-99. Moving undetected during an infiltration requires a considerable amount of time. The infiltrating unit
  moves from its assembly area or current position through the start point and then continues moving along the
  infiltration route to a release point. If small elements are conducting the infiltration, the unit uses a series of
  linkup points to reassemble into a coherent unit.
  2-100. If the complete unit is conducting the infiltration, the forward security force begins its movement
  first and the main body follows. The distance between the forward security force and the main body depends
  on the mission variables. The security force must be far enough ahead of the main body so that it can either
  deploy or move to another route if the forward security force discovers enemy forces. The forward security
  force in an infiltration needs enough time to move in a stealthy and secure manner. Enemy units should not
  be able to move undetected between the forward security force and the main body.
  2-101. As the infiltrating unit moves, the security force reports the cover and concealment of each route,
  enemy activity, location of danger areas and linkup points, enemy activity on the objective, and other combat
  information. The unit attempts to avoid enemy and civilian contact; however, contact does not always mean
  the mission is compromised. The infiltrating unit engages targets first with indirect fires to avoid revealing
  its presence and exact location.
  2-102. If necessary, the forward security force conducts actions on contact while the main body moves to
  another route, reconstitutes a forward security force, and continues the mission. If the main body makes
  contact unexpectedly, it either bypasses the encountered enemy force or attacks the enemy force if the enemy
  has little combat power or cannot be bypassed. During an infiltration, the forward security force ignores
  ineffective enemy fire and continues to move.
  2-103. The infiltrating unit’s elements move to an assembly area or an objective rally point to consolidate
  and reorganize their combat power, refine the plan, and conduct any last-minute coordination before
  continuing the mission. The unit then conducts those tasks needed to accomplish its mission, which could be
  an attack, raid, ambush, seizing key terrain, or information collection.
  2-104. Units may need to abort an infiltration operation if the mission variables change during the
  infiltration, creating a condition where units can no longer accomplish the infiltration. Examples of changes
  that might trigger such an action include—
  * Significant portions of the infiltrating force’s combat power are lost through navigation errors,
  enemy action, accidents, or maintenance failures.
  * Movement or significant reinforcement of a force-oriented objective.
  * Detection of the infiltration by enemy forces.
  * Changes in the tactical situation that make the mission no longer appropriate.
  Units develop criteria for aborting the infiltration as part of the planning process. They transmit the decision
  to abort the infiltration to all appropriate headquarters for action and information.