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Pentagon data breach exposes Social Security numbers, personal info of 2.76M US military, civilian personnel

10/1/2026

A data breach at the Pentagon exposed the personal information of 2.76 million living U.S. military and civilian personnel and 294,000 deceased individuals.

A Pentagon official confirmed the incident to Fox News, stating that unauthorized users accessed unencrypted files containing Social Security numbers and employment details.

The Defense Manpower Data Center identified a security gap in its file-sharing platform on July 16, following an intrusion that began in October 2025 and ended in July 2026.

The center reached out to affected people on Sept. The Pentagon said it has no indication that the exposed information was misused.

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