# Defense Manpower Data Center (DMDC)

Type: Company

Source: Legal & RegTech Intelligence Brief — https://getlegalbrief.com/entity/defense-manpower-data-center-dmdc
Canonical HTML page: https://getlegalbrief.com/entity/defense-manpower-data-center-dmdc

## Timeline

- **2026-09-29**: Breach disclosed in reports — ABC News, CNN and aggregators report the breach, citing a U.S. defense official confirming 2.76 million living and 294,000 deceased individuals affected.
- **2026-07**: Vulnerability discovered and remediated — DMDC detects the intrusion and patches the vulnerability, ending roughly nine months of unauthorized access.
- **2025-10**: Unauthorized access begins — A DMDC information system experiences unauthorized access of personally identifiable information by a small number of unauthorized users, per a defense official.

## Recent coverage (1 stories)

### Pentagon's 3.05M-Record Breach Raises Privacy Act Liability
2026-09-29 10:19:06 · Sentiment: Strongly negative · Impact: 9/10 · Sources: 2

The DMDC compromise of 3.05 million personnel records — with a nine-month dwell time and no detected misuse — exposes the Defense Department to Privacy Act claims, congressional scrutiny and OPM-style class action litigation. Affected military and civilian personnel may pursue damages for SSN and job-detail exposure.
Full story: https://getlegalbrief.com/story/pentagon-dmdc-breach-privacy-act-liability

---
This page is a machine-readable summary. Sentiment measures the directional read of each development for this entity, not the tone of the reporting; impact weights consequence, not syndication reach. See https://getlegalbrief.com/guides/methodology for the full editorial methodology.