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3M Combat Arms Earplugs

From 2003 to 2015, Aearo Technologies Inc. and 3M Company supplied the United States military with dual-ended Combat Arms earplugs. Hearing loss and tinnitus are the most common causes of service-related disability among veterans, and these earplugs filled an urgent need. But design defects may have caused damage to the hairs and nerves of the inner ear in unsuspecting military personnel.

3M Company’s dual-ended Combat Arms earplugs were standard issue in certain branches of the United States military from 2003 until the company stopped producing them in 2015. Aearo Technologies Inc. created the earplugs, and 3M bought the company in 2008, according to a company press release.

The dual-ended Combat Arms earplugs filled an immediate need for hearing protection for servicemen and women. Hearing loss, tinnitus and other hearing impairments are the most common service-connected disabilities for men and women in the armed forces, according to the U.S. Department of Veteran’s Affairs.

More than 1.16 million veterans received disability compensation for hearing loss in 2017, and about 1.79 million received compensation for tinnitus, according to the Hearing Health Foundation.

Hearing problems are the most common service-connected disabilities for men and women in the armed forces.
Source: U.S. Department of Veteran’s Affairs

Thousands of soldiers received dual-ended Combat Arms earplugs, especially those deployed to Iraq and Afghanistan in the early 2000s.

But in 2016, a Moldex-Metric Inc. whistleblower lawsuit against 3M said the dual-ended Combat Arms earplugs were defective. The lawsuit accused 3M of fraud and said the company had sold the product to the military for more than a decade without informing the government of the defect.

In 2018, the U.S. Department of Justice reached a $9.1 million settlement with 3M to resolve allegations that the company “knowingly sold the dual-ended Combat Arms Earplugs, Version 2 (CAEv2) to the United States military without disclosing defects that hampered the effectiveness of the hearing protection device,” according to a Justice Department press release.

Now, hundreds of veterans have filed hearing loss and tinnitus lawsuits against 3M, according to Military Times.

How Do the Earplugs Work?

The dual-ended Combat Arms earplugs are non-linear, selective attenuation earplugs. Unlike with most earplugs, Aearo designed these plugs to provide two options for sound reduction depending on how a soldier wears them.

Wearing the plug with the olive-colored end in the ear — in the “closed” or “blocked” position — blocks all sound like a traditional earplug would. If a soldier wears the plug with the yellow end in the ear — in the “open” or “unblocked” position — the plugs block or significantly reduce loud noises such as battlefield explosions but still allow the wearer to hear spoken orders or approaching enemy combatants.

Moldex’s lawsuit claimed the “earplugs have dangerous design defects that can cause them to loosen in the wearer’s ear.” Because the earplug stem is too short, “it is difficult to insert the plug deeply into some wearer’s ear canals.”

According to the lawsuit, “when the earplug is inserted into the ear according to standard fitting instructions, the basal edge of the third flange of the non-inserted end of the earplug is prone to press against some wearers’ ear canals and fold back to its original shape, thereby loosening the seal.”

When the earplugs became loose, it was difficult for the wearer or another person looking at the earplug to tell it was loose.

“These earplugs have dangerous design defects that can cause them to loosen in the wearer’s ear.”

Moldex-Metric, Inc. v. 3M Company

Soldiers thought they were protected from dangerous levels of noise, but they were actually at risk for hearing loss and tinnitus.

Who Used Combat Arms Earplugs?

Aearo won an exclusive contract bid to supply the military with its dual-sided earplugs from 2003 to 2012. After 3M bought Aearo in 2008, it took over the contract and continued to supply ear protection to thousands of soldiers in the Army, Air Force, Navy and Marines.

Moldex began selling its BattlePlugs in 2012 after winning the military contract from 3M, but 3M continued to produce its dual-ended Combat Arms earplugs until 2015.

Combat operations, extended training periods, and more powerful noises from aircraft, vehicles and weapons systems continued to increase the risk of hearing loss in soldiers, according to a 2008 article by D. Scott McIlwain and colleagues in the American Journal of Public Health.

“The U.S. Marine Corps was so convinced of the effectiveness of the Combat Arms earplug that it ordered over 20,000 pairs, thereby temporarily depleting the entire national stock in 2003.”

It was a big problem for soldiers in the war in Iraq (Operation Iraqi Freedom) because of improvised explosives, rocket propelled grenades and mortar rounds. By the time the war in Afghanistan (Operation Enduring Freedom) started, Aearo had introduced the dual-ended Combat Arms earplug.

In 2004, the military issued Combat Arms earplugs to all deploying soldiers.

“The U.S. Marine Corps was so convinced of the effectiveness of the Combat Arms earplug that it ordered over 20,000 pairs, thereby temporarily depleting the entire national stock in 2003,” authors wrote.

3M supplied several military bases across the country. The company’s South Carolina plant supplied earplugs to several local bases that trained soldiers for wars in Iraq and Afghanistan, according to Moldex’s whistleblower complaint. These bases included: Shaw Air Force Base, the Marine Corp Recruiting Depot at Parris Island, the Naval Weapons Station Charleston and Fort Jackson.

Hearing Damage in the Military

Hearing impairment — including hearing loss and tinnitus — remains the number one disability among veterans, according to the Military Health System. Noise exposure in the military can occur 24 hours a day. It can have profound effects on health and well-being.

“Higher risks of anxiety, depression, and PTSD coupled with hearing impairment and noise-induced hearing injury (HINIHI) can have a compounded impact on [quality of life] among the military population compared to the effects on the civilian population,” researcher Hasanat Alamgir and colleagues wrote in Military Medical Research.

High intensity or impulse noise most often causes the hearing loss. A large number of service members lost their hearing because of roadside bombs in Iraq and Afghanistan operations, according to researcher Timothy S. Wells and colleagues in Noise & Health. Seventy-one percent of these soldiers reported loud noise exposure and 15 percent reported tinnitus, or ringing in the ears.

“It constantly reminds me of getting hit. I don't want to sit here and think about getting blown up all the time. But that's what [tinnitus] does.”

Staff Sgt. Ryan Kelly

Hearing loss and tinnitus affect a soldier’s ability to perform his or her job, but they also affect mental health. In veterans with tinnitus, 72 percent had anxiety, 60 percent had depression and 58 percent had both conditions, according to the Hearing Health Foundation.

For former Staff Sgt. Ryan Kelly of Austin, Texas, tinnitus is a constant reminder of the trauma he experienced on the battlefield near Baghdad in 2003.

“It’s funny, you know. When it happened, I didn’t feel my leg gone. What I remember was my ears ringing. It is constantly there,” he told the Associated Press. “It constantly reminds me of getting hit. I don’t want to sit here and think about getting blown up all the time. But that’s what it does.”

Military Hearing Loss Prevention

Unfortunately, service members often cannot control the noise they are exposed to. Hearing tests and protective gear such as earplugs remain the main preventative measures.

The Department of Defense Hearing Center of Excellence recommends the EARS 2 U prevention strategy:
  • Educate yourself about hazardous noise
  • Adjust the volume of your personal listening devices
  • Recognize and reduce noise hazards
  • Select and properly use hearing protection devices
  • Seek annual hearing health services from an audiologist
  • Understand the consequences of unprotected exposure to noise, including permanent inner ear damage
3M Dual-Ended Combat Arms Earplugs
3M Earplug Facts
  1. USES Hearing protection (primarily for the military)
  2. INJURIES Hearing loss, tinnitus from defective plugs
  3. MANUFACTURERS Aearo Technologies Inc., 3M Company

Please seek the advice of a medical professional before making health care decisions.

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Michelle Llamas, Senior Content Writer
Written By Michelle Llamas Senior Writer

Michelle Llamas has been writing articles and producing podcasts about drugs, medical devices and the FDA for nearly a decade. She focuses on various medical conditions, health policy, COVID-19, LGBTQ health, mental health and women’s health issues. Michelle collaborates with experts, including board-certified doctors, patients and advocates, to provide trusted health information to the public. Some of her qualifications include:

  • Member of American Medical Writers Association (AMWA) and former Engage Committee and Membership Committee member
  • Centers for Disease Control and Prevention (CDC) Health Literacy certificates
  • Original works published or cited in The Lancet, British Journal of Clinical Pharmacology and the Journal for Palliative Medicine
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Emily Miller Managing Editor

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  2. Alamgir, M. et al. (2016). The impact of hearing impairment and noise-induced hearing injury on quality of life in the active-duty military population: challenges to the study of this issue. Retrieved from
  3. Associated Press. (2008, March 7). Hearing loss is silent epidemic among U.S. troops. Retrieved from
  4. Department of Defense Hearing Center of Excellence. (n.d.). Hearing Loss Prevention. Retrieved from
  5. Hearing Health Foundation. (n.d.). Veteran Statistics. Retrieved from
  6. Keebaugh, A. (2018, September 20). Noise impact on hearing loss. Retrieved from
  7. Langford, C. (2019, January 22). Army Vet Blames Earplug Maker for Hearing Damage. Retrieved from
  8. McIlwain, D.S. et al. (2008). Heritage of Army Audiology and the Road Ahead: The Army Hearing Program. Retrieved from
  9. Rempfer, K. (2019, February 14). Hundreds of vets are suing over these defective combat earplugs. Retrieved from
  10. Smith, C. (2019, January 23). Combat Veteran Sues 3M Over Defective Hearing Plugs. Retrieved from
  11. U.S. Department of Veteran Affairs. (n.d.). VA Research on Hearing Loss. Retrieved from
  12. United States Department of Justice. (2018, July 26). 3M Company Agrees to Pay $9.1 Million to Resolve Allegations That it Supplied the United States With Defective Dual-Ended Combat Arms Earplugs. Retrieved from
  13. United States of America ex rel. Moldex-Metric, Inc. v. 3M Company. (2016, May 12). In the United States District Court for the District of South Carolina Columbia Division. Complaint, Jury Trial Demanded. Case No. 3:16-1533-MBS. Retrieved from
  14. Wells, T.S. et al. (2015). Hearing loss associated with US military combat deployment. Retrieved from
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