Dan Caldwell, a senior adviser to Defense Secretary Pete Hegseth, has been placed on administrative leave and was escorted out of the Pentagon on Tuesday, two defense officials confirmed.

The move comes amid an internal investigation into the unauthorized disclosure of Department of War information, adding fresh tension to an already heightened environment within the Pentagon over leaks and internal security.

The defense officials, who spoke on condition of anonymity due to the sensitive nature of personnel matters, said Caldwell’s removal is directly linked to the probe but declined to detail the nature of the leak or the specific information involved.

The situation underscores an increasingly aggressive stance by the Department of War under the Trump administration toward rooting out and penalizing unauthorized disclosures of national security-related materials.

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Caldwell, a former Marine, was a close and trusted aide to Secretary Hegseth and had long-standing ties to him, dating back to their time together at the conservative nonprofit Concerned Veterans for America (CVA).

Caldwell joined CVA in 2013, serving first as policy director and later as executive director. During Hegseth’s tenure, the organization struggled with financial difficulties, but both men remained politically active and influential in veteran policy circles.

His deep involvement in defense matters extended into digital communication networks among senior officials.

Pretty suspicious that Dan Caldwell, a guy the deep state hates is all the sudden a leaker and escorted out of the pentagon. Or perhaps he's a patsy... pic.twitter.com/osz4P5Vb3S

— Deeps (@IBringTheDeeps) April 15, 2025

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Caldwell was reportedly the staff member designated as Hegseth’s point person in a private Signal messaging group that included top Trump national security officials.

That group, initially established by National Security Adviser Michael Waltz, was used to discuss plans for a military strike against Houthi militants in Yemen.

The chat made headlines when The Atlantic's editor in chief, Jeffrey Goldberg, was inadvertently added to the group, prompting questions about the security protocols surrounding sensitive military discussions.

Caldwell’s sudden ouster was first reported by Reuters and has sparked a wave of speculation and concern among defense officials.

The Pentagon has not commented publicly on the precise nature of the leaks under investigation.

Adding to the seriousness of the situation, Hegseth’s chief of staff, Joe Kasper, issued a sharply worded internal memo on March 21 warning of an impending crackdown on unauthorized disclosures.

The memo stated that the Pentagon would be investigating leaks of national security information and suggested the use of polygraph testing as part of the process.

Kasper wrote, “I expect to be informed immediately if this effort results in information identifying a party responsible for an unauthorized disclosure, and that such information will be referred to the appropriate criminal law enforcement entity for criminal prosecution.”

While the memo provided no specific examples of the leaks being investigated, it made clear that the Defense Department views the issue with utmost severity.

The broader context is a Pentagon and White House under mounting pressure to prevent damaging leaks of classified or sensitive material.

President Trump and his senior officials have repeatedly decried what they view as politically motivated disclosures to the media, and recent high-profile breaches have only intensified scrutiny.

Caldwell’s background reflects a steady climb through the ranks of conservative defense policy circles.

After graduating from Arizona State University in 2011, he worked as a public policy adviser at Defense Priorities, a Washington-based think tank that promotes a more restrained U.S. foreign policy.

His views aligned closely with the administration’s stance on reducing American military engagement overseas while maintaining a strong national defense posture.

Despite Caldwell’s credentials and deep relationships within the department, his abrupt removal serves as a stark reminder that even high-level insiders are not immune to the consequences of internal investigations.

While no formal charges have been filed as of yet, the Defense Department has indicated that it will not hesitate to pursue criminal prosecution if evidence of wrongdoing emerges.

The probe has already had a chilling effect on internal communications, with some staffers reportedly limiting what they say over encrypted channels or in meetings.

One defense official noted, “There’s a real sense that everything is being watched and that no one is untouchable. People are nervous, and for good reason.”

As the investigation unfolds, attention will likely remain fixed on what, if any, information was leaked, whether it compromised national security, and who else may be implicated.

For now, Caldwell’s departure marks the latest chapter in an increasingly fraught battle over secrecy, loyalty, and accountability within the highest levels of the Pentagon.

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