Roughly 50 members of the U.S. military's Joint Staff were subjected to polygraph tests in August 2026 as part of an expanding Pentagon investigation into leaks about the Iran war and the country's strained munitions stockpiles. Investigators pressed officers and civilian employees on whether they disclosed classified information to journalists about diminished U.S. stocks of long-range missiles and Patriot interceptors, weapons systems that were depleted as the war with Iran created a shortage of crucial munitions.
The examinations, first detailed by The New York Times, targeted the Joint Staff, which numbers between 1,500 and 2,000 officers and officials. Investigators asked those tested whether they had provided information about the depleted munitions stocks and whether they had disclosed classified national security information to members of the press, according to the paper's reporting from Jonathan Swan, Adam Entous, and Maggie Haberman. The probe centers on news reports that detailed the diminished stocks of crucial munitions, a disclosure the Pentagon has treated as a serious breach.
Pentagon spokesman Sean Parnell declined to discuss specifics, saying the department does not comment on internal personnel or investigative matters but takes all leaks of classified national security information extremely seriously and investigates accordingly. Parnell added that securing classified information is critical to ensuring the security of the United States and troops deployed around the world.
Testing Reached Far Beyond the Pentagon Building
The August round of polygraphs was not confined to Joint Staff headquarters in Washington. According to CBS News, several dozen additional military officials — including personnel at U.S. Central Command and combatant commanders — were polygraphed over the summer regarding the munitions stockpile leaks. None of the officials tested failed the media-leak questions, the network reported, underscoring how wide the counterintelligence sweep grew.
Notably absent from the testing pool was Gen. Dan Caine, the Chairman of the Joint Chiefs of Staff, who was explicitly exempted from undergoing a polygraph during the leak probe, per the same CBS News account. The exemption for the military's top uniformed officer highlights an uneven application of the scrutiny even as rank-and-file officers and civilian staff across multiple commands were required to sit for the exams.
A Crackdown Nearly Two Years in the Making
The August tests represent the culmination of an anti-leak campaign that has been building inside the Pentagon since early 2025. Defense Department Chief of Staff Joe Kasper issued a memo in March 2025 initiating a formal investigation into unauthorized national security disclosures and introducing polygraph testing as an investigative tool, as reported at the time by AP News. That same month, the crackdown extended beyond the Pentagon, with Homeland Security Secretary Kristi Noem pledging expanded polygraph testing for DHS staff and the Justice Department investigating separate intelligence leaks tied to Venezuelan gang enforcement, according to AP News.```markdown
By October 2025, the push had escalated further. A draft memorandum authored by Deputy Defense Secretary Steve Feinberg outlined plans to require more than 5,000 personnel in the Office of the Secretary of Defense and the Joint Staff to submit to random polygraphs and sign strict non-disclosure agreements, The Washington Post reported. The document described plans to tighten controls on internal communications.
Legal Limits on What a Polygraph Can Actually Prove
Despite the scale of the testing, the article does not detail the legal constraints on using polygraph results inside the military justice system. It does not specify how such results would be treated in court-martial proceedings.
The testing was investigative and appeared intended in part to intimidate potential leakers. The probe focused on whether personnel had disclosed information to members of the news media.
Leak Suspicions Have Already Strained Military Leadership
The polygraph campaign has already surfaced friction between civilian Pentagon leadership and senior military officers. The New York Times reported that Defense Secretary Pete Hegseth decided against promoting Lt. Gen. Douglas A. Sims II, prompting Gen. Caine to intervene on Sims's behalf after the officer was cleared. That episode illustrates how leak suspicions, even unproven ones, have directly shaped high-level military personnel decisions before the August 2026 tests were administered.
