Defense Secretary Pete Hegseth subjected dozens of high-ranking military officials to polygraph tests in August 2026 as part of a sweeping Pentagon leak investigation into classified information about weapons stockpiles, according to U.S. officials briefed on the matter. The mass testing of top military brass represents an unprecedented action in modern U.S. military history, marking an extraordinary escalation in Hegseth’s efforts to identify and prosecute leakers.
Approximately 50 military officers and civilian employees from the Joint Staff, including U.S. Central Command officials and other combatant commanders, underwent the polygraph examinations, CBS News reported. The tests focused on whether these officials had disclosed classified national security information to journalists, with polygraph questions delving deeply into various sensitive matters. No one failed the questions specifically designed to determine if they leaked to the media, according to two sources familiar with the investigation.
The New York Times first reported that mass polygraph tests have never been administered to the top ranks of the U.S. military in modern history. While polygraph testing is sometimes part of routine security procedures for top officials, the volume and scope of this investigation was extremely rare, military officials said. Chairman of the Joint Chiefs of Staff Gen. Dan Caine was notably not polygraphed, a senior Pentagon official confirmed.
The leak investigation centered on classified details about U.S. weapons stockpiles during the ongoing Iran war. Media reports in early August had disclosed concerns about the rapid depletion of sophisticated, limited-supply munitions—including details that the military had used virtually all of its long-range precision missiles in strikes inside Iran. President Trump was reported to be furious about the leaks, with officials expressing concern that a very small group had access to the classified information and worrying whether anyone might be acting as a foreign intelligence asset.
Hegseth’s crackdown on leaks intensified in July 2026 when he announced a joint Pentagon-Justice Department task force to identify and prosecute people suspected of disclosing sensitive government information to the press. The task force was tasked with investigating what Hegseth called a critical threat to national security. In his announcement, Hegseth emphasized that leaked information “risks lives” and committed substantial Pentagon resources to the effort. The Pentagon’s Office of General Counsel, led by Earl Matthews, was given broad authority to demand records and assistance for leak investigations.
The investigation also reflected broader tensions within the Trump administration over national security disclosures. Trump had publicly threatened severe punishment for leakers, vowing to pursue long prison sentences for those found responsible. The administration’s aggressive posture toward press leaks marked a significant intensification of efforts to control information flow from the Pentagon, following years of Hegseth’s previous attempts to crack down on unauthorized disclosures.
Pentagon spokesman Sean Parnell said in a statement that the Department “takes all leaks of classified national security information extremely seriously and investigates accordingly,” adding that securing classified information is critical to ensuring the security of the United States and deployed troops.
Sources
- CBS News — reported that dozens of high-ranking military officials were subjected to polygraph tests in August 2026, with no one failing the leak-related questions; confirmed Trump’s reported anger and concerns about foreign intelligence assets
- The New York Times — first reported the polygraph testing and noted that mass polygraph tests have never been administered to top military ranks in modern history
- Al Jazeera — reported that approximately 50 officers on the Joint Staff were interrogated over reports about depleted weapons stockpiles
- Washington Post — reported Hegseth’s July 2026 announcement of the joint Pentagon-Justice Department task force to identify and prosecute leakers
- The Hill — confirmed the July 2026 task force announcement and Hegseth’s commitment to identify and prosecute leakers
- Reuters — reported that the U.S. had used virtually all of its long-range precision missiles during the Iran war
- USA Today — covered Hegseth’s announcement that the task force would investigate leaks and expand efforts to identify and prosecute leakers
