Group

Close air support (CAS)

Line 1: Handshake

• Establish communications with the aircraft
• Identify yourself and declare a CAS request

Format:

[Aircraft Callsign], this is [FAC Callsign], CAS request

Example:

HAMMER 1-1, this is SIERRA 1, CAS request

Aircraft response:

HAMMER 1-1, send CAS request

Line 2: Target Location

• Provide the target location using the most appropriate reference method

Format (choose one):

• GRID [grid reference]
• SHIFT TRP [name], NORTH/SOUTH xx, EAST/WEST xx
• TRP [name]

Examples:

GRID 118094

SHIFT TRP ALPHA, NORTH 150, EAST 75

TRP ALPHA

Line 3: Target Description and Marking

• Briefly describe the target
• Include target size, type, environment, and marking method

Format:

[target type/size], [environment/cover], (marked by [method], [laser code if applicable])

Examples:

Infantry in treeline

Squad in compound, marked by red smoke

Single vehicle in open, marked by sparkle

Infantry in treeline, marked by laser, code 1688

Line 4: Friendly Positions

• Identify friendly positions relative to the target
• Include friendly marking methods where applicable

Format:

Friendlies [distance] [direction] of target, (marked by [method])

Examples:

Friendlies 200 metres south of target

Friendlies 150 metres east of target, marked by blue smoke

Friendlies no factor

Line 5: Attack Guidance, Restrictions & Ordnance

• Specify attack direction and restrictions
• Request desired ordnance
• State danger close where applicable

Format:

[attack direction], [restrictions], Request [ordnance], (danger close if applicable)

Examples:

Attack north to south, Request HE Rocket

Attack south to north, no fires west of target, Request Bomb

Attack east to west, remain north of friendlies, Request guns danger close

Attack north to south, light AA threat from compound west of target, Request Maverick

Aircraft response:

• Readback of lines 2-5

A FAC may require a CAS attack to be conducted from a specific direction to ensure safe and effective employment of weapons. This may be required for reasons including:

• Deconfliction with friendly forces.
• Avoidance of restricted airspace, such as air defence threats or national boundaries.
• Reducing the risk of friendly fire during Danger Close engagements.

Ingress and egress directions can be specified using one of two methods:

• Cardinal Direction
  • Example: “Ingress from north-east to south-west.”
     
• Pre-established Marker
  • Example: “Ingress from Marker Alpha.”

Plot target reference points, TRP, on prominent map and terrain features for the purposes of shared known points.

Label TRPs in the format "TRP [group identifier] [number 01–10]", where the distinct group identifier broadly summarises an area of operations, phase, or cardinal direction relative to friendly positions or movements. 

Examples: “TRP N01” or “TRP SE03”.

• When entering or re-entering an AO
  • Establish communications with the supported element
  • Provide aircraft capabilities and limitations

Format

[FAC Callsign], this is [Aircraft Callsign],

Include:

• Aircraft team composition
• Current location
• Available ordnance
  • Rockets
  • Guns
  • Missiles
  • Bombs
    • Skip if not applicable
• Night vision capability (if applicable)
• Available station time in minutes (if required)

Example

• SIERRA 1, this is HAMMER 1-1. 
• We are a flight of two A-10s, currently orbiting GRID 042167. 
• Ordnance available:
  • 38 HE Rockets
  • 2,400 rounds 30mm
  • 6 GBU12
• Night vision capable.
• 40 minutes station time remaining.

Aircraft should confirm target identification before engagement.
Examples:

Visual infantry in treeline

Visual red smoke

Following each attack:

• Aircraft report observed effects
• FAC assesses results
• FAC may re-clear, adjust, redirect, or terminate the engagement

• Monitor aircraft attacks and battlefield changes
• Update target information when required
• Adjust restrictions as necessary
• Terminate the attack if conditions become unsafe

Abort Command 

STOP STOP STOP

Immediately terminates the current attack run

Evasive Action 

EVADE

Directs the aircraft to break off and prioritise aircraft safety

Reclearing

Recleared, same target

Directs the aircraft to reengage the same target 

Terminating the engagement

Terminate, target destroyed

Ends the engagement 

• Confirm a correct readback has been received.
• Select the appropriate clearance type.
• Restate danger close if applicable
• Monitor the engagement and adjust, restrict, reclear or terminate the attack as required.

Format

Readback correct, Cleared In Type II

Readback correct, Cleared In Type III

Alternative Format

Cleared Hot Type X

Cleared to Engage Type X

Danger Close Example

Readback correct, Cleared Hot Type II, Danger Close

• Line 1: [Aircraft Callsign], this is [FAC Callsign], CAS request
  • Aircraft response: [Aircraft Callsign], send CAS request
• Line 2: GRID [grid reference] OR TRP [name] OR SHIFT TRP [name], NORTH/SOUTH [Distance in metres], EAST/WEST [Distance in metres]
• Line 3: [target type/size], [environment/cover], marked by [method], [laser code if applicable]
• Line 4: Friendlies [distance] [direction] of target, (marked by [method])
• Line 5: [attack direction], [restrictions], Request [ordnance], danger close (if applicable)
  • Aircraft response: Readback of lines 2-5

Following a correct readback, the FAC may issue a clearance. The clearance type defines the level of engagement authority granted to the aircraft against the designated target or target area.

• Type II
  • Authorises a single engagement against the designated target.
• Type III
  • Authorises multiple engagements against the designated target or target area until:
    • The FAC terminates the engagement, or
    • The aircraft assesses the target has been neutralised

The FAC retains authority to adjust, restrict, or abort the attack at any time.

Aircraft may refuse a CAS request if they assess it creates unacceptable risk to the airframe or mission.

• Receive the readback.
• Confirm the receiver has correctly read back all required information.
• If the readback is incorrect:
  • State "Negative Readback".
  • Identify the incorrect line.
  • State the correct information for that line.
  • Direct the aircraft to read back the corrected line.
  • Verify the corrected readback.
  • Repeat as required until all information is correct.
• Proceed with request

Example

Sender:

Friendlies 200 metres north of target.

Receiver:

Negative Readback. Line 4. Friendlies 200 metres south of target. Read back Line 4.

Sender:

Line 4, friendlies 200 metres south of target.

Danger Close refers to targets within 300 metres of friendly forces. Engagements at this distance present an increased risk of friendly casualties from weapon effects. As a result, both the FAC and aircrew should exercise additional caution, positively identify the target, and carefully consider the suitability of the selected weapon and attack profile before authorising and executing the strike.

During a CAS mission, the pilot must visually identify the target before employing weapons. The FAC should use the most appropriate target marking method for the situation and clearly state the method during Line 3 of the CAS request.

Smoke

Smoke may be deployed by hand or fired from a 40 mm launcher, either directly on or adjacent to the target. The FAC should state the smoke colour and describe the target's position relative to the smoke. Consider that other smoke of the same colour may already be present in the area, potentially causing confusion.

Tracer

If friendly forces are actively engaging the target, tracer fire may be used as a reference. This method is only appropriate where friendly and hostile forces use different tracer colours, reducing the risk of misidentification and fratricide.

Sparkle

During low-light operations, an infrared (IR) laser visible through night vision devices may be used to mark the target. The FAC should move the laser in a circular motion around the target, allowing the pilot to distinguish the stationary origin of the laser from the moving point marking the target. If necessary, the pilot may request a more obvious indication, such as pointing the laser vertically to identify the FAC's position or increasing the size of the circling motion.

Laser Designator

Where aircraft are capable of detecting laser designators, the FAC may use a laser designator to mark the target. The same laser may also be used to guide laser-guided munitions where appropriate.

Landmarks

Large, distinctive landmarks may be used to talk a pilot onto the target. Chosen landmarks should be clearly visible from the air, easily distinguishable from surrounding terrain, and unique enough to avoid confusion.

Map Markers and Grids

Map markers and grid references should not be relied upon for visual target acquisition. While they provide an approximate location, they are generally insufficient for a pilot to accurately identify a specific target without an accompanying visual reference.

Laser codes allow compatible munitions to be assigned a specific guidance code, preventing multiple laser sources from interfering with weapon guidance. In ACE, laser codes can be adjusted using Ctrl + Alt + Q/E to increment or change the currently selected laser code.

The FAC must communicate the active laser code to the pilot, allowing the aircraft to configure its weapons to guide onto the correct laser source.

This functionality only applies to ACE-compatible laser-guided munitions and will not function with non-ACE munitions. For simplicity, effective laser discipline and ensuring only one active laser source is present can achieve the same practical outcome in most situations.

Aircraft: F/A-18 — Raven 1
FAC: Mike 7

Line 1
FAC: “Raven One, this is Mike, CAS request.”
Aircraft: “Raven One, send CAS request.”

Line 2
FAC: “GRID 123,456.”

Line 3
FAC: “Hostile fortification, fortified position, marked by red smoke and laser, laser code 1234.”

Line 4
FAC: “Friendlies 700 metres east of target.”

Line 5
FAC: “Ingress from south, Request guided bomb.”

Aircraft Readback:
Aircraft: “Raven One, target GRID 123,456. Hostile fortification, fortified position, marked by red smoke and laser, laser code 1234. Friendlies 700 metres east of target. Ingress from south, requesting guided bomb.”

FAC:
“Raven One, readback correct, Cleared Hot Type II.”

Aircraft:
“Raven One, inbound.”

Aircraft (Target Identification):
“Raven One, visual red smoke, visual hostile fortification.”

(Aircraft conducts attack.)

Aircraft (Follow-on CAS Actions):
“Raven One, off target, observed impacts on target, fortification damaged.”

FAC:
“Raven One, assessing effects, stand by.”

Aircraft: A-10C — Hog 4
FAC: Anvil 7

Line 1
FAC: “Hog 4, this is Anvil, CAS request.”
Aircraft: “Hog 4, send CAS request.”

Line 2
FAC: “GRID 069,420.”

Line 3
FAC: “Infantry platoon, open terrain, marked by red smoke and tracers 200 metres south of a large industrial complex.”

Line 4
FAC: “Friendlies 200 metres north of target.”

Line 5
FAC: “Ingress from east, caution MANPADS in the area, Request guns, Danger Close.”

Aircraft Readback:
Aircraft: “Hog 4, target GRID 169,420. Infantry platoon, open terrain, marked by red smoke and tracers 100 metres north of a large industrial complex. Friendlies 200 metres north of target. Ingress from east, caution MANPADS in the area, requesting guns, Danger Close.”

FAC (Incorrect Readback):
“Negative. Target GRID 069,420. Infantry platoon, open terrain, marked by red smoke and tracers 200 metres south of a large industrial complex. Friendlies 200 metres north of target. Ingress from east, caution MANPADS in the area, requesting guns, Danger Close.”

Aircraft Readback:
“Hog 4, target GRID 069,420. Infantry platoon, open terrain, marked by red smoke and tracers 200 metres south of a large industrial complex. Friendlies 200 metres north of target. Ingress from east, caution MANPADS in the area, requesting guns, Danger Close.”

FAC:
“Hog 4, readback correct, Cleared Hot Type II, Danger Close.”

Aircraft:
“Hog 4, inbound.”

Aircraft (Target Identification):
“Hog 4, visual red smoke, visual infantry platoon.”

(Aircraft conducts attack.)

Aircraft (Follow-on CAS Actions):
“Hog 4, off target, observed impacts on target, infantry dispersing, enemy still active.”

FAC:
“Hog 4, re-clear same target, engage remaining infantry.”

Aircraft:
“Hog 4, in hot.”

(Aircraft conducts second attack.)

Aircraft (Follow-on CAS Actions):
“Hog 4, off target, observed impacts on target, enemy casualties confirmed, remaining infantry withdrawing.”

FAC:
“Hog 4, terminate, target neutralised.”

Aircraft: AH-6 — Egg 2
FAC: Reaper 7

Line 1
FAC: “Egg 2, this is Reaper, CAS request.”
Aircraft: “Egg 2, send CAS request.”

Line 2
FAC: “GRID 2234,4353.”

Line 3
FAC: “Six technicals with 50 cal, open terrain, marked by IR sparkle.”

Line 4
FAC: “Friendlies no factor.”

Line 5
FAC: “Ingress as required, Request guns.”

Aircraft Readback:
Aircraft: “Egg 2, target GRID 2234,4353. Six technicals with 50 cal, open terrain, marked by IR sparkle. Friendlies no factor. Requesting guns.”

FAC:
“Egg 2, readback correct, Cleared Hot Type III.”

Aircraft:
“Egg 2, inbound.”

Aircraft (Target Identification):
“Reaper, Egg 2, unable to determine target location from sparkle. Request increased laser movement.”

FAC:
“Egg 2, Reaper, Wilco. Sparkle now circling the target.”

(FAC increases the IR laser movement around the target to improve target identification.)

Aircraft:
“Egg 2, visual technicals, in hot.”

(Aircraft conducts first attack.)

Aircraft (Follow-on CAS Actions):
“Egg 2, off target, observed impacts on target, two technicals destroyed, four remaining.”

FAC:
“Egg 2, continue engagement.”

(Aircraft conducts additional attacks.)

Aircraft:
“Egg 2, off target, observed impacts on target, remaining technicals destroyed.”

FAC:
“Egg 2, terminate, target neutralised.”