7.4 9-Line MEDEVAC Request Protocol and Tactical Evacuation Procedures

9-Line MEDEVAC Request Protocol and Tactical Evacuation Procedures

Core Doctrine: The standardized 9-Line MEDEVAC Request is the primary tactical communication format utilized across all branches of the United States Armed Forces to request medical evacuation for wounded personnel. Governed by TC 4-02.1 (First Aid), ATP 4-02.83 (Tactical Combat Casualty Care), and FM 3-53.2 (Medical Evacuation), the 9-Line protocol ensures unambiguous, rapid transmission of critical casualty and tactical data over secure radio networks.

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1. Tactical Context: The "Golden Hour" and Radio Protocol

In military trauma medicine, the Golden Hour refers to the critical 60-minute window following traumatic combat injury during which definitive surgical resuscitation must be initiated to prevent irreversible shock and death. To maximize survivability, the Department of Defense enforces a standard requiring that critically wounded casualties (Urgent precedence) reach advanced forward surgical intervention (Role 2 Forward Resuscitative Surgical Detachment [FRSD] or Role 3 Field Hospital) within 60 minutes of injury.

Because every second directly impacts casualty survival, radio transmissions must be concise, accurate, and disciplined. Casualties are coordinated over secure Single Channel Ground and Airborne Radio System (SINCGARS) networks, tactical satellite (TACSAT), or high-frequency (HF) combat nets using standard military phonetic alphabet and numeric pronunciation rules.

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2. The 9-Line MEDEVAC Request: Line-by-Line Breakdown

Every noncommissioned officer must have the 9-Line MEDEVAC format committed to memory and be capable of transmitting it without hesitation under simulated or active combat conditions.

   LINE 1: Location of Pick-up Site
   • 6-digit or 8-digit Military Grid Reference System (MGRS) coordinates.
   • Must include 100km grid square identifier (e.g., 'EG 1234 5678').
   
   LINE 2: Radio Frequency, Call Sign, and Suffix
   • Operating frequency of the requesting unit (e.g., '38.90 MHz').
   • Call sign and suffix of the contact at the LZ (e.g., 'Saber 6').
   
   LINE 3: Number of Patients by Precedence
   • A = Urgent (evacuation required within 2 hours to save life, limb, or eyesight)
   • B = Urgent-Surgical (requires forward surgical intervention within 2 hours)
   • C = Priority (evacuation required within 4 hours; serious injury/illness)
   • D = Routine (evacuation required within 24 hours; non-deteriorating)
   • E = Convenience (administrative evacuation rather than medical necessity)
   
   LINE 4: Special Equipment Required
   • A = None
   • B = Hoist (tactical extraction where terrain prevents landing)
   • C = Extraction equipment (specialized ropes, cutting shears)
   • D = Ventilator (mechanical ventilation required for airway casualty)
   
   LINE 5: Number of Patients by Type
   • L = Number of Litter patients (stretcher-bound / non-ambulatory)
   • A = Number of Ambulatory patients (walking wounded)
   ─────────────────────────────────────────────────────────────────
   MANDATORY MILESTONE: LINES 1 THROUGH 5 TRANSMITTED WITHIN 25 SECONDS
   ─────────────────────────────────────────────────────────────────
   LINE 6: Security at Pick-up Site (Wartime) / Wound Type (Peacetime)
   • Wartime: N = No enemy troops in area
              P = Possible enemy troops (approach with caution)
              E = Enemy troops in area (approach with caution)
              X = Enemy troops in area (armed escort required)
   • Peacetime: Number and types of wounds, injuries, or illnesses
   
   LINE 7: Method of Marking Pick-up Site
   • A = Standard panels (VS-17 signal panel)
   • B = Pyrotechnic signal (star cluster, flare)
   • C = Smoke signal (colored smoke grenade)
   • D = None
   • E = Other (IR strobe, chem light buzzsaw, flashlight)
   
   LINE 8: Patient Nationality and Status
   • A = US Military
   • B = US Civilian
   • C = Non-US Military (Coalition / allied partner)
   • D = Non-US Civilian (Host nation local national)
   • E = EPW (Enemy Prisoner of War - requires armed guard escort)
   
   LINE 9: CBRN Contamination (Wartime) / Terrain Description (Peacetime)
   • Wartime: C = Chemical
              B = Biological
              R = Radiological
              N = Nuclear
   • Peacetime: Terrain description (obstacles, wires, towers, slope)

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3. Transmission Standards and Operational Rules

The 25-Second Launch Rule

By tactical standard, Lines 1 through 5 MUST be transmitted within 25 seconds of initial radio contact with the evacuation operations dispatch.

• Why: Lines 1 through 5 contain the minimum essential information necessary for the aviation commander to verify flight routing, assign an aircraft (e.g., HH-60M Dustoff), determine patient capacity (litter vs. ambulatory configurations), assemble required life-support equipment (hoist, ventilator), and scramble the aircraft immediately.
• En-Route Transmission: Lines 6 through 9 do not delay aircraft launch; they are transmitted while the aircrew is en route to the landing zone or once radio contact is established between the ground team and the inbound pilot.

Phonetic and Numeric Disciplines

To eliminate transmission errors over degraded tactical frequencies:

• Numbers are pronounced as individual digits: "1-0" is spoken as "WUN-ZERO", "3" is pronounced "TREE", "5" is "FIFE", and "9" is "NINER".
• Coordinate letters use the standard NATO phonetic alphabet (Alpha, Bravo, Charlie...).
• Do not include conversational filler ("uh," "we got," "please send"); state line numbers followed directly by letter codes.

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4. Landing Zone (LZ) Preparation and Marking

Selecting, preparing, and securing a suitable Landing Zone (LZ) is an NCO responsibility that ensures the evacuation helicopter can land safely without rolling over or taking ground fire.

Landing Zone Dimensions and Criteria

   AIRCRAFT LZ CLEARANCE STANDARDS (DAY VS. NIGHT)
   ─────────────────────────────────────────────────────────────────
   Aircraft Type             Daytime Diameter     Nighttime Diameter
   ─────────────────────────────────────────────────────────────────
   UH-72A Lakota             75 x 75 feet         100 x 100 feet
   UH-60 Black Hawk / HH-60M 100 x 100 feet       150 x 150 feet
   CH-47 Chinook             175 x 175 feet       200 x 200 feet
   ─────────────────────────────────────────────────────────────────

• Surface and Slope: The landing surface must be relatively level, firm, and free of loose debris (trash, loose ponchos, empty MRE boxes) that can be sucked into turbine engine intakes or thrown by rotor wash. Ground slope must be less than 7 degrees for standard wheel landings; slopes exceeding 15 degrees prevent any landing.
• Obstacle Clearance: Ensure a 10:1 obstacle clearance ratio along the approach and departure axes (for every 10 feet of horizontal distance, obstacles such as trees or power lines cannot exceed 1 foot in height).
• Wind Direction: Helicopters land and take off into the wind to maximize lift over the rotor system.

The Tactical Smoke Verification Protocol

Marking an LZ with colored smoke is the most common visual signaling method during daylight operations, but it presents severe tactical risks if compromised by enemy forces.

   TACTICAL SMOKE AUTHENTICATION STANDARD
   ─────────────────────────────────────────────────────────────────
   1. Inbound pilot contacts ground unit: 'Saber 6, Dustoff 33 inbound, mark LZ.'
   2. Ground unit deploys smoke grenade and transmits:
      'Dustoff 33, Saber 6, smoke popped.'
   3. CRITICAL RULE: Ground unit NEVER states the color of the smoke over the radio.
   4. Pilot visually acquires smoke and calls out color:
      'Saber 6, Dustoff 33 identifies PURPLE smoke.'
   5. Ground unit verifies or denies:
      'Dustoff 33, Saber 6, that is AFFIRMATIVE, purple smoke.'
   ─────────────────────────────────────────────────────────────────

Why the Smoke Rule Exists: If a ground unit announces "I popped yellow smoke" over an unencrypted or compromised frequency, enemy combatants within sight can throw their own yellow smoke to lure the helicopter into an ambush, or throw blue smoke to confuse the pilot. By requiring the pilot to identify the color first, deception is prevented.

Nighttime LZ Marking

• Inverted "Y" Lighting: A five-light visual array using chemical lights or flashlights forming an inverted letter "Y" to indicate the exact touchdown point and landing heading.
• IR Strobes / Buzzsaws: Infrared (IR) strobes visible only through Night Vision Devices (NVDs), or a chemical light tied to a 3-foot length of 550 cord swung in an overhead circle (the "chem light buzzsaw").

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5. Documentation: The DD Form 1380 TCCC Casualty Card

The DD Form 1380 (TCCC Card) is the official Department of Defense pre-hospital medical record for combat trauma. It provides the receiving surgical team with an immediate, definitive audit of injuries sustained and interventions executed.

   DD FORM 1380 CRITICAL DATA FIELDS
   ─────────────────────────────────────────────────────────────────
   • Casualty Demographics: Name, Battle Roster Number, Service, MOS.
   • Mechanism of Injury: Blast, GSW, Blunt, Burn, Crush.
   • Anatomical Injury Map: Visual diagram shading wounded regions.
   • Signs and Vitals: Pulse, BP, Resp Rate, Pulse Ox (SpO2), AVPU.
   • Interventions Executed: Tourniquet placement times (T = HHMM),
     needle decompressions, vented chest seals, NPA, junctional wraps.
   • Medications Administered: Analgesics (fentanyl, ketamine, CWMP),
     antibiotics (moxifloxacin), tranexamic acid (TXA), and time.
   • First Responder Identity: Name and rank of provider.
   ─────────────────────────────────────────────────────────────────

• Attachment Standard: The completed DD Form 1380 must be placed inside its protective waterproof plastic sheath and physically affixed to the casualty's wrist or upper left uniform pocket. It is never placed in loose pockets or taped to litter frames where it can be lost during air transit.

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6. Complete 9-Line Reference Template Table

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7. Tactical Radio Transmission Scenario: Point-of-Injury MEDEVAC

To master standard radio procedures, review this realistic tactical script between ground team leader "Viper 1" and air ambulance dispatch "Dustoff 33":

   TACTICAL RADIO TRANSMISSION SCRIPT
   ─────────────────────────────────────────────────────────────────
   VIPER 1:    'Dustoff 33, this is Viper 1, request immediate MEDEVAC, over.'
   DUSTOFF 33: 'Viper 1, this is Dustoff 33, transmit Lines 1 through 5, over.'
   
   [TIMER STARTS - 25 SECONDS TO TRANSMIT LINES 1-5]
   VIPER 1:    'Dustoff 33, this is Viper 1:
                Line 1: Grid EG 4589 1234.
                Line 2: Frequency 42.50, Call Sign Viper 1.
                Line 3: One Alpha, One Charlie.
                Line 4: Alpha.
                Line 5: One Lima, One Alpha, over.'
   
   DUSTOFF 33: 'Viper 1, Dustoff 33 reads back:
                Line 1: Grid EG 4589 1234.
                Line 2: 42.50, Viper 1.
                Line 3: One Alpha, One Charlie.
                Line 4: Alpha.
                Line 5: One Lima, One Alpha.
                Bird is spinning, transmit Lines 6 through 9, over.'
   
   VIPER 1:    'Dustoff 33, this is Viper 1:
                Line 6: Papa.
                Line 7: Charlie.
                Line 8: Two Alpha.
                Line 9: November, over.'
   
   DUSTOFF 33: 'Viper 1, Dustoff 33 copies all, en route your location, ETA 12 minutes, over.'
   VIPER 1:    'Viper 1, out.'
   ─────────────────────────────────────────────────────────────────