People search U.S. Department of Defense data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 2 U.S. Department of Defense-linked incidents, with headline counts up to 14K+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why U.S. Department of Defense breach history matters
U.S. Department of Defense operates in Government (United States). Across indexed rows, recurring themes include mixed intrusion and disclosure events. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2009 — — 72k records
Cataloged incident. Lost media. 72k records. Exposed categories include Names, emails, addresses, and other PII. BreachHistory cites approximately 720 affected records in this row. See the us-dod2009 and canonical BreachHistory entry.
2006 — — U.S. Department of Defense: A hacker accessed a Tricare Management Activity…
Cataloged incident. A hacker accessed a Tricare Management Activity (TMA) public server containing personal information about military employees. TMA is used to provide health care services to military personnel and their families. Exposed categories include Personal information. BreachHistory cites approximately 14K+ affected records in this row. See the us-dod2006 and canonical BreachHistory entry.
Patterns and analysis
- Mixed intrusion and disclosure events — appears across multiple U.S. Department of Defense catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Bookmark the U.S. Department of Defense company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/us-dod · Latest: us-dod2009.
Sources: BreachHistory catalog (2 rows for U.S. Department of Defense), company and regulator disclosures cited in individual breach records.