Group

Control measures

Control measures are tools used to organize, coordinate, and manage forces during an operation.

They help commanders and units:

• Maintain alignment and spacing
• Synchronize movement, fires, and support
• Define boundaries, objectives, and responsibilities
• Prevent fratricide or confusion

What a Sector Is

A sector is a designated area of responsibility within a town or urban objective, assigned to a squad or team for clearance.

Sectors help:

• Divide complex urban areas into manageable portions
• Maintain control and accountability
• Coordinate movement, fires, and support

Sectors should be sensible, clear, and easy to reference.

Best Practices

• Keep Sectors Manageable
  • Each sector should be sized so the assigned team can clear it efficiently without overextension.
  • Avoid overly large or irregular sectors that complicate coordination.
• Use a Simple Naming System
  • Standardize names using a grid-like system: A1, A2, B1, B2, etc.
  • Rows and columns help adjacent units easily identify boundaries.
  • Avoid complicated or inconsistent names.
• Align Sectors with Terrain
  • Use streets, canals, ridgelines, or major buildings to define borders.
  • Physical features make sectors easier to recognize during movement and coordination.
• Assign Responsibility Clearly
  • Each sector must have an assigned element responsible for clearing and reporting progress.
  • Ensure overlapping coverage at boundaries is minimized to prevent gaps or duplication.
• Coordinate Adjacent Sectors
  • Establish coordination points at intersections or key terrain features.
  • Adjacent teams should maintain visual or radio contact when possible.

Communication

Report progress by sector:

• “1-1 cleared Sector A2.”
• “Team Bravo securing Sector B1.”

Use sector names for directing support, fires, or follow-on movement.

Above: Example sectors for a town objective

What an Objective Box Is

An Objective Box (OB) is a clearly defined area representing the full extent of an objective, such as an entire town, village, or urban complex.

• It defines the boundaries of the objective.
• It ensures all units understand the area requiring clearance.
• Within the OB, the area can be subdivided into smaller sectors for individual squads or teams.

Best Practices

• Anchor to Terrain
  • Use roads, rivers, canals, ridgelines, or urban landmarks to mark the OB’s corners.
  • Clearly recognizable features make coordination and orientation easier.
• Size Appropriately
  • Cover the entire objective to prevent missed areas.
  • Avoid making it so large that it becomes unmanageable for assigned forces.
• Subdivide into Sectors
  • As per FM/BG-1524 - Sectors
• Coordinate Support
  • Use the OB as a reference for fire support, CAS, and logistics.
  • Synchronized actions are easier when all elements reference the same boundaries.

Communication

Reference the OB in orders and reports:

• “1st Platoon clearing Objective Box Alpha, Sector A2.”
• “All elements secure Objective Box Bravo as per orders.”

Above: Example objective box for a town objective

What a Line of Departure Is

• A Line of Departure (LoD) is the designated line where an assault or advance begins.
• It signals the transition from preparation or assembly to movement or attack.

The LoD is a control measure, not an objective. Crossing it initiates the operation.

When to Use

Most effective in:

• Deliberate assaults
• Platoon- or company-level attacks
• Coordinated multi-element movements

Generally unnecessary for small patrols or spontaneous actions.

Best Practices

• Anchor to recognizable terrain (road, ridgeline, tree line, or urban feature).
• Clearly define who crosses first and in what order.
• Ensure all support (fires, logistics, follow-on elements) is prepared before crossing.
• Tie crossing to a trigger (e.g., H-Hour or command order).

Communication

Keep reports concise:

• “1-1 crossing LoD.”
• “All elements set on LoD.”

Above: Example Line of departure location.

Definitions

• RV (Rendezvous):
  • A planned link-up point where elements meet during movement or prior to execution.
• ERV (Emergency Rendezvous):
  • A pre-designated rally point used if elements become separated, break contact, or lose communication.
• FRV (Final Rendezvous):
  • The last designated assembly point immediately prior to initiating an attack. It is used to consolidate all assault elements, confirm final readiness, and complete last-minute coordination before crossing the line of departure or beginning the final assault phase.

When to Use

• RVs can be used in all operations.
• ERVs are used when elements become separated or C2 is degraded.
• FRVs are used specifically during offensive operations as the final consolidation point before execution of an attack.

Best Practices

• Anchor to recognizable terrain.
  • Use intersections, buildings, terrain features, or distinct map references.
• Keep locations practical.
  • Avoid exposed or tactically unsound areas.
• Assign purpose clearly.
  • RV: Planned link-up during movement
  • ERV: Emergency regroup point
  • FRV: Final consolidation prior to assault
• Limit quantity.
  • Over-designating rendezvous points causes confusion.

Execution Considerations

• At an RV:
  • Confirm accountability
  • Conduct quick coordination
  • Adjust plan if required
  • Conduct medical and/or resupply
• At an ERV:
  • Establish security
  • Rebuild command and control
  • Await further direction
• At an FRV:
  • Conduct final accountability of assault elements
  • Confirm weapons, ammunition, and readiness status
  • Rehearse or confirm assault plan and timing
  • Synchronise final fire support or enabling assets
  • Issue final go/no-go confirmation before execution

Communication

Use concise reporting:

• “1-1 set at RV.”
• “All elements at FRV.”
• “Breaking contact to ERV.”

Above: Example RVs for town objective.

What a Phase Line Is

A Phase Line (PL) (sometimes known as Report Line) is a named control measure drawn across the area of operations to assist with coordination and synchronization.

PLs are used to regulate:

• Tempo of maneuver
• Fire support shift/lift
• Movement of follow-on elements
• Engagement or fallback triggers

A Phase Line is not an objective or a mandatory halt line unless specifically stated.

Planning test:
If crossing the PL does not trigger an action or report, it likely does not need to exist.

When to Use Phase Lines

Most effective in deliberate, structured operations such as:

• Platoon- or company-level assaults
• Mechanized or multi-element manoeuvre
• Fire support integration
• Layered defensive plans

They are generally unnecessary for small, fluid, squad-only actions.

Best Practices

• Anchor to terrain: 
  • Use recognizable features (roads, ridgelines, rivers, major streets).
• Limit quantity:
  • Use only what is required to control tempo or fires.
  • Too many PLs create clutter and unnecessary reporting.
• Tie to action:
  • Crossing a PL should trigger something:
    • Shift/lift fires
    • Commit follow-on elements
    • Authorize engagement
    • Execute fallback
    • a halt to maintain cohesion with other elements
• Align to the axis of advance:
  • Draw PLs perpendicular to movement to clearly show progression.

Common Applications

• Offense:
  • Control tempo and fire shifts during assaults.
• Movement:
  • Define bounds during controlled advances.
• Fire Support:
  • Establish fire limits or lift points.
• Defence:
  • Set engagement triggers or fallback criteria.

Naming and Communication

Use one consistent naming convention (e.g., ALPHA / BRAVO / CHARLIE, GOLD / SILVER / BRONZE, 1 / 2 / 3).

Keep reports concise:

• “1-1 at PL ALPHA.”
• “2-1 crossing PL BRAVO.”
• “All elements set at PL CHARLIE.”

Above: Example phase lines for a town objective.

What Boundaries and Lanes Are

• Boundaries are control measures that separate adjacent units’ areas of responsibility during movement or assault.
• Lanes are assigned corridors within which a unit advances or moves.

They are used to:

• Prevent friendly collisions or overlapping fields of fire
• Maintain alignment and direction of advance
• Organize multiple elements moving along the same axis

Boundaries define limits laterally, while lanes define the path forward.

Best Practices

• Anchor to Terrain
  • Use streets, ridgelines, rivers, or other clear features to define lateral limits.
  • Lanes should follow easily navigable routes (roads, alleys, or trails).
• Keep Dimensions Manageable
  • Boundaries: wide enough for safety but narrow enough to prevent drift.
  • Lanes: allow movement without congestion, obstacles, or crossfire.
• Assign Responsibility
  • Each element knows which lane or side of the boundary they occupy.
  • Overlaps only at designated coordination points.
• Coordinate Fires and Movement
  • Use boundaries to prevent friendly fire.
  • Ensure support elements respect the lateral limits.

Naming and Communication

Name boundaries and lanes clearly (e.g., Lane 1, Lane 2; Boundary RED, Boundary BLUE).

Report positions and movements using the assigned lane/boundary:

• “1-1 advancing Lane 2.”
• “Squad Bravo holding Boundary RED.”

Above: Example attack lanes for a town objective.

What a Limit of Exploitation Is

A Limit of Exploitation (LoE) defines the maximum depth an attacking element may advance.

It is used to prevent:

• Overextension
• Loss of mutual support
• Collision with adjacent units
• Advancing beyond sustainment

An LoE is a control boundary, not an objective.

When to Use

Most effective in:

• Deliberate assaults
• Mechanized breakthroughs
• Multi-element attacks
• Operations with adjacent units

Generally unnecessary for small, short-duration missions.

Best Practices

• Anchor to clear terrain when possible (road, river, ridgeline).
• State what happens at the LoE (halt, hold, or await orders).
• Require authorization before advancing beyond it.

The LoE should control depth and maintain cohesion without slowing momentum.

Communication

Keep reporting simple:

• “1-1 at LoE.”
• “Objective secure, holding at LoE.”

Movement beyond the LoE should be deliberate and directed.

Above: Example Limit of Exploitation for a town objective.

• Identify phase lines, boundaries, sectors, and objective boxes on mission maps.
• Plan fire team or squad movement to remain within assigned sectors, lanes, and limits of exploitation.
• Deconflict actions to prevent overlap, friendly collisions, or breaches of assigned boundaries.
• Report positions and status at designated rendezvous points (RV, FRV, ERV) or sector boundaries.