US Military Data Breach History

This page tracks the US Military data breach history and cybersecurity incidents affecting US Military (United States). BreachHistory currently indexes 9 publicly disclosed or catalogued incidents spanning 2006 through 2011, with approximately 103.8 million records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The US Military breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest US Military Data Breaches

The largest indexed incidents include the 2009 — US Military: Without first destroying the data the agency sent…, the 2006 — US Military: The Veterans Affairs Department agreed to pay $20…, and the 2010 — US Military: Wikileaks, 392K records, along with additional historical incidents involving exposed passwords, public databases, and large-scale data scraping. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by US Military or a regulator. Below is the list of large data breaches:

• 2009 2009 — US Military: Without first destroying the data the agency sent… — about 76.0M records exposed · Catalogued incident
• 2006 2006 — US Military: The Veterans Affairs Department agreed to pay $20… — about 26.5M records exposed · Catalogued incident
• 2010 2010 — US Military: Wikileaks, 392K records — about 392.0K records exposed · Catalogued incident
• 2010 2010 — US Military: Data breach reported, 300K records — about 300.0K records exposed · Catalogued incident
• 2010 2010 — US Military: Wikileaks, Wikileaks / Bradley Manning/Cablegate, 260K records — about 260.0K records exposed · Catalogued incident
• 2009 2009 — US Military: About 131,000 former and current Army Guard members… — about 131.0K records exposed · Catalogued incident
• 2009 2009 — US Military: According to a report to Congress, assessment forms… — about 72.0K records exposed · Catalogued incident
• 2011 2011 — US Military: Accidentally published, 50K records — about 50.0K records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, passwords, phone numbers, names, profile information, account identifiers, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

US Military Data Breach 2026

At the time of this update, no US Military data breach has been catalogued for 2026. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a US Military data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This US Military breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.