Patrol Lane
P5

CBRN OPERATIONS

9 sec (mask) 1 min (MOPP 3→4) 5 min (decon)

Conditions: You are in MOPP level 2 when you suspect a chemical/biological attack.

Understanding This Task

9 seconds to don, clear, and seal your mask — this is one of the hardest time standards. You start the moment you open the mask carrier and stop when the mask collapses against your face on the seal check.

RSDL decontamination: Scrub exposed skin, break mask seal to scrub face, reseal immediately. Avoid eyes and wounds. Do NOT apply to mask lens.

GAS! GAS! GAS! — you must shout this AND give the hand-and-arm signal.

Common NO-GO Mistakes

  • Exceeding 9 seconds to don, clear, and seal — instant NO-GO
  • Not shouting "GAS! GAS! GAS!" — graded step
  • RSDL on mask lens (causes loss of transparency)
  • RSDL in eyes or on wounds

Task Basis: 031-COM-1004, 031-COM-1006, 031-COM-1011

Video Resources

BCT CBRN Gas Mask Training
Protective mask donning procedures
CBRN PPE Training
CBRN personal protective equipment including M50 mask
Mask Timer: 9 Seconds
0:09
Critical Notes
  • 9 SECONDS to don, clear, and seal mask — instant NO-GO if slower.
  • Shout "GAS! GAS! GAS!" — this is a graded step.
  • RSDL: avoid contact with eyes and wounds. Do not apply to mask lens.

PERFORMANCE MEASURES

0/9 GO
  1. 1

    Don mask assembly CRITICAL

    • Stop breathing and close eyes.
    • Remove helmet. Open mask carrier (9 SEC TIMER STARTS).
    • Grasp mask with firing hand. Place chin in chin pocket, press face piece tight.
    • Grasp harness tab, pull over and down head.
    • Grasp cheek straps one at a time, pull until tight.
  2. 2

    Clear mask assembly

    • Seal outlet disk valve with hand. Blow out hard.
  3. 3

    Seal mask assembly

    • Cover both filter inlet ports with palms. Breathe in.
    • Mask should collapse against face. Resume breathing. (9 SEC TIMER STOPS)
  4. 4

    Give the alarm CRITICAL

    • Shout "GAS! GAS! GAS!"
    • Give appropriate hand-and-arm signal per unit SOP.
  5. 5

    Close mask carrier

  6. 6

    Don mask hood (if applicable)

  7. 7

    Seek overhead cover (MOPP 4 begins)

  8. 8

    Decontaminate hands, face, and inside of mask

    • Open RSDL packet. Scrub exposed skin of both hands with applicator pad.
    • Break mask seal, scrub face thoroughly. Avoid eyes/wounds.
    • Scrub inside surfaces of mask including drinking tube.
    • Reseal mask immediately. Clear and check seal.
    • Scrub forehead, scalp, neck, ears, throat. Secure hood. Scrub hands again.
    • Don protective gloves (MOPP 4 complete).
  9. 9

    Decontaminate equipment

    • Open M334 kit. Remove wipe, unfold completely.
    • Wipe all contaminated equipment using sweeping motions away from body.
    • Dispose of contaminated waste per SOP.
P4: Camouflage P6: Map Reading