text: Security Operations
  RELIEF IN PLACE
  5-168. A relief in place is an operation in which, by direction of higher authority, all or part of a unit is
  replaced in an area by the incoming unit and the responsibilities of the replaced elements for the mission and
  the assigned zone of operations are transferred to the incoming unit (JP 3-07.3). Commanders conduct a relief
  in place as part of a larger operation, primarily to maintain the combat effectiveness of committed units.
  Cavalry units conduct relief in place operations for the following reasons:
  * Reconstitute a unit that has sustained heavy losses.
  * Decontaminate a committed unit.
  * Rest a unit that has been in prolonged combat.
  * Conform to a larger tactical plan.
  * Resupply a defending Cavalry unit.
  * Assign a new mission to the relieved unit.
  * Introduce a new unit into combat.
  * Set the stage for resuming the offense.
  5-169. Defensive relief is conducted to continue the defense. Cavalry units can relieve a larger force as an
  economy of force defensive mission. Offensive relief may follow from a follow-and-assume mission
  requiring a forward passage of lines.
  RELIEF TECHNIQUES
  5-170. There are three techniques for conducting a relief: sequentially, simultaneously, or staggered. A
  sequential relief is the most time-consuming relief technique but the most secure. Relief proceeds by troop
  or company team. Normally, units are relieved in place with the relieving unit assuming the relieved unit’s
  positions and missions. This technique is most common when units have similar organizations or when
  occupied terrain must be retained.
  5-171. The simultaneous relief technique is faster but less secure because all units are moving at the same
  time. The decentralized nature of a simultaneous relief requires close coordination to prevent excessive
  battlefield clutter. Once command groups and combat trains are collocated, troops move forward at the same
  time along designated routes. Relief occurs simultaneously at each location. Relieved units withdraw
  immediately upon relief.
  5-172. A staggered relief occurs when a commander relieves each element in a sequence determined by the
  tactical situation, not its geographic orientation. A staggered relief occurs with relief elements occupying
  positions in-depth or adjacent to the relieved unit; this is considered an area relief. This technique is
  appropriate when units are dissimilar, when the relieving unit performs a different mission, or when improved
  defensive terrain is away from the line of contact. A staggered relief is also appropriate when the unit being
  relieved has been contaminated chemically or radiologically. The relieved unit withdraws one unit at a time
  or simultaneously and conducts a rearward passage of lines through the relieving unit, if appropriate.
  PLANNING CONSIDERATIONS
  5-173. Fire support coordination and liaison are conducted between the units. If field artillery units are to
  be relieved, they are the first to collocate and the last to leave. DA Form 5517 (Standard Range Card) target
  lists, and overlays are given to the incoming unit to ensure the effective delivery of fire. If printed DA Form
  5517s are not available, use what you have on hand. Fire support assets of the relieved unit remain in position
  throughout the relief of maneuver units and are prepared to support both units. Fire support assets of the
  relieving unit move into positions as quickly as possible so they can support both units during the relief.
  Combat trains are collocated to facilitate coordination and transfer of equipment, excess ammunition, fuel,
  water, and medical supplies.
  5-174. The relieving unit establishes continuous liaison with the relieved unit immediately upon receipt of
  the order. The squadron command group moves to the contact point of the relieving unit to coordinate the
  operation. The relieving unit enters and monitors the command net of the relieved unit. Troops and company
  teams of both units remain on their internal and parent unit nets. The relieving unit maintains radio listening