USMC Reports Data Breach Impacting Sensitive Personal and Health Information
The U.S. Marine Corps (USMC) recently disclosed a data breach to the New Hampshire Attorney General, revealing that sensitive personal identifiable information (PII) and protected health information (PHI) may have been compromised. The incident was detected on May 14, 2025, when USMC identified suspicious activity within a limited segment of its network.
Following an investigation, USMC confirmed that an unauthorized third party accessed sensitive data. The exposed information varies by individual but may include:
- Full names
- Social Security numbers
- Dates of birth
- Contact details
- Driver’s license and government ID numbers
- Financial account information (e.g., mortgage details)
- Medical records
In response, USMC has begun notifying affected individuals via mail, providing details on the compromised data and offering complimentary credit monitoring services. The breach notice filed with the New Hampshire Attorney General outlines the scope of the incident and the steps taken to mitigate risks.
Source: https://straussborrelli.com/2026/03/10/us-mortgage-corporation-data-breach-investigation/
Marine Corps Recruiting cybersecurity rating report: https://www.rankiteo.com/company/united-states-marine-corps
"id": "UNI1773182377",
"linkid": "united-states-marine-corps",
"type": "Breach",
"date": "5/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'industry': 'Defense',
'location': 'United States',
'name': 'U.S. Marine Corps (USMC)',
'type': 'Government/Military'}],
'customer_advisories': 'Notifying affected individuals via mail with details '
'on compromised data and offering complimentary credit '
'monitoring services',
'data_breach': {'personally_identifiable_information': ['Full names',
'Social Security '
'numbers',
'Dates of birth',
'Contact details',
'Driver’s license '
'numbers',
'Government ID '
'numbers',
'Financial account '
'information',
'Medical records'],
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Personal Identifiable '
'Information (PII)',
'Protected Health Information '
'(PHI)']},
'date_detected': '2025-05-14',
'description': 'The U.S. Marine Corps (USMC) disclosed a data breach to the '
'New Hampshire Attorney General, revealing that sensitive '
'personal identifiable information (PII) and protected health '
'information (PHI) may have been compromised. The incident was '
'detected on May 14, 2025, when USMC identified suspicious '
'activity within a limited segment of its network. An '
'unauthorized third party accessed sensitive data, including '
'full names, Social Security numbers, dates of birth, contact '
'details, driver’s license and government ID numbers, '
'financial account information, and medical records.',
'impact': {'data_compromised': 'Sensitive personal identifiable information '
'(PII) and protected health information (PHI)',
'identity_theft_risk': 'High',
'payment_information_risk': 'High',
'systems_affected': 'Limited segment of USMC network'},
'investigation_status': 'Ongoing',
'references': [{'source': 'New Hampshire Attorney General'}],
'regulatory_compliance': {'regulatory_notifications': 'Filed breach notice '
'with the New Hampshire '
'Attorney General'},
'response': {'communication_strategy': 'Notifying affected individuals via '
'mail, providing details on '
'compromised data and offering '
'complimentary credit monitoring '
'services'},
'threat_actor': 'Unauthorized third party',
'title': 'USMC Data Breach Impacting Sensitive Personal and Health '
'Information',
'type': 'Data Breach'}