Immaculate Constellation Program Disclosure

Overview

In April 2025, Michael Shellenberger, an investigative journalist, brought to the attention of Congress a stunning allegation from an internal government whistleblower: the U.S. Pentagon has secretly operated an unacknowledged special access program (USAP) codenamed "Immaculate Constellation" designed to track, recover, and reverse-engineer non-human spacecraft and technology. The disclosure marked a turning point in the disclosure era, formally entering allegations of a hidden UAP program into the Congressional Record and shifting the debate from speculation to documented claims backed by a credible government insider.

The Whistleblower and Disclosure

Matthew Brown, a former U.S. national security analyst with extensive experience in the Office of the Secretary of Defense, the Under Secretary of Defense for Intelligence and Security, and the State Department, publicly identified himself on the WEAPONIZED podcast on April 29, 2025. Brown, who held Top Secret/Sensitive Compartmented Information (TS/SCI) clearances, claims he authored a comprehensive report detailing the Immaculate Constellation program after stumbling upon classified databases containing information about the program. Representative Nancy Mace subsequently entered Brown's 12-page report into the official Congressional Record, lending institutional credibility to the whistleblower's account. The report contains two major sections: one detailing the alleged USAP structure and operations, and a second focusing on signals intelligence (SIGINT) imagery.

Brown's decision to go public, following the pattern established by David Grusch's 2023 testimony, represents a continuation of the disclosure movement where credible government insiders are breaking silence about alleged hidden UAP programs. The timing and details suggest coordination with the ongoing Congressional investigations into UAP coverups.

Program Structure and Claims

According to the disclosure, Immaculate Constellation functions as a "parent" unacknowledged special access program that consolidates observations of UAPs from both tasked and untasked collection platforms across U.S. military and intelligence agencies. The program reportedly was established in 2017—specifically in response to the New York Times publication of details about the informal Pentagon UAP program known as AATIP (Advanced Aerospace Threat Identification Program). When AATIP became public, allegedly forcing transparency discussions, the executive branch supposedly created Immaculate Constellation as a more deeply hidden successor program operating under even stricter compartmentalization.

The alleged program employs sophisticated artificial intelligence systems to secretly search classified servers used by the U.S. military and intelligence community for UAP-related imagery and data. According to Brown's report, Immaculate Constellation is housed within the White House and operates outside normal Congressional oversight mechanisms, with funding hidden through classified budget allocations. The program purportedly involves multiple federal agencies and has the authority to conduct recovery operations of anomalous vehicles and materials.

Government Denial and Official Response

Within days of the disclosure, Department of Defense spokesperson Sue Gough issued a categorical denial: "The Department of Defense has no record, present or historical, of any type of SAP called 'IMMACULATE CONSTELLATION.'" This denial mirrors the official responses to earlier whistleblower claims by David Grusch and others. The All-Domain Anomaly Resolution Office (AARO), the official Pentagon office tasked with investigating UAP matters, similarly stated that it "has not discovered any verifiable information to substantiate" claims of hidden UAP programs.

Significantly, in January 2026, the Office of the Secretary of Defense declined to conduct a Freedom of Information Act (FOIA) email search for "Immaculate Constellation," asserting that the subject matter "does not exist" in government records. This response pattern—denial coupled with refusal to search—has become characteristic of official government responses to UAP disclosure claims, raising questions about whether the absence of admissions reflects the program's non-existence or its security compartmentalization.

Credibility and Context

The disclosure carries contested credibility. On one hand, Matthew Brown presents as a credible national security professional with legitimate access and experience. On the other hand, the Pentagon's categorical denials and the program's alleged extreme compartmentalization mean no independent verification has emerged. The allegation fits within the broader pattern of disclosure-era claims about hidden government UAP programs, following similar allegations from Grusch (2023) and earlier whistleblowers. The fact that the report reached Congressional record through Rep. Mace provides institutional validation, even as the executive branch denies its core claims.