The 27 April briefing deadline that House Oversight Committee Chairman James Comer and Subcommittee Chairman Eric Burlison imposed on four federal agencies came and went on Monday with no public confirmation that any of the four required briefings had been delivered. The FBI, NASA, the Department of War and the Department of Energy had each been given staff-level briefing requirements covering at least eleven, and now thirteen, missing or dead United States scientists tied to nuclear, aerospace and UAP-adjacent research. None of the four agencies issued a public readout by close of business in Washington on 27 April.
The Department of War is the only agency that has produced any on-the-record response to the Committee’s inquiry. In a written statement to Committee staff dated approximately 16 April, the Department confirmed that there are ‘no active national security investigations’ of any reported missing person who was a current or former DoW clearance holder and involved in special access programmes. Comer and Burlison wrote back stating that the answer ‘leaves the Committee with many unanswered questions’. Their 20 April letter to Secretary of War Pete Hegseth quoted the response back at the agency and used it to justify the formal 27 April briefing demand.
The phrasing of the Department of War response is the key to the impasse. The statement is narrow. It says no current DoW investigation is open. It does not say whether any of the listed individuals were ever clearance holders. It does not say whether any of them ever participated in special access programmes. It does not address what the Department knows about their work history under earlier classification authorities, prior contractor arrangements, or programmes outside the standard SAP register. Burlison and Comer have read the response as an evasion. The Committee’s 20 April letter is published on the Oversight website and is the operative document for the deadline.
What the Briefings Were Supposed to Cover
The four agency briefings were tied to a specific list. The Committee identified eleven individuals as of the 20 April letter; Burlison’s 25 April letter to FBI Director Kash Patel and his subsequent statements expanded the list to thirteen names, with Matthew James Sullivan and Dr Ning Li added in the late-April update. The list runs from former Air Force Major General William Neil McCasland, the seventh commander of the Air Force Research Laboratory at Wright-Patterson, who has been missing from his home in Albuquerque since 27 February 2026, through three NASA Jet Propulsion Laboratory researchers (Michael Hicks, Frank Maiwald and Monica Reza), to physicist Dr Ning Li, the University of Alabama in Huntsville antigravity researcher whose Department of Defense funded work disappeared from public view before her 2021 death.
The Committee’s letters demanded that each agency address two questions for each name on the list. First: was the individual a clearance holder, contractor or programme participant connected to that agency. Second: what procedures, if any, the agency now has in place to protect sensitive scientific personnel and classified research given the pattern. Burlison has separately stated publicly that he ‘would not be surprised if foreign adversaries such as China, Russia or Iran were involved’. The foreign-operation framing has been logged on this site since 22 April.
The Indexed Headline
A Los Angeles Magazine headline, ‘Congress UAP Briefing Sparks Mystery Over Missing Scientists’, appears in news indexing for the late-27 April window. The body of the article could not be verified directly to this watchdog through the access channels available at the time of writing. The headline alone is consistent with at least three different storylines: a closed briefing was delivered and the Committee characterised it negatively; a closed briefing was delivered and the contents were thinner than the Committee expected; or a briefing did not materialise and the Committee said so. Until the body of that report or a parallel account from another outlet is verifiable, this site will not characterise what was said in any briefing on 27 April. The deadline is logged factually as having arrived without public agency confirmation.
What the Committee Can Do Next
The Committee’s 20 April letter set out the four-agency request without specifying enforcement steps. The standard ladder for a House oversight committee, after a missed informal request followed by a missed formal letter, is committee-level subpoena. Subpoenas from the Oversight Committee can be issued by the Chairman with notice to the ranking member, and historically the Committee has used that authority sparingly when an agency response is incomplete rather than absent. The decision now sits with Comer.
Representative Anna Paulina Luna, who runs the Task Force on the Declassification of Federal Secrets and is the lead member on a separate but related Pentagon UAP-video request, has previously stated that she is prepared to work with Chairman Comer to use the Committee’s subpoena authority on the parallel 46 video file demand. The 46-video deadline was 14 April. The 27 April scientists deadline is the second missed deadline against the same four-agency block in two weeks. The cumulative posture, if Comer chooses to take it, supports a formal subpoena package covering both items.
Open Questions This Watchdog Will Track
Five threads remain open after 27 April. First, whether any of the four agencies issues a public characterisation of a closed briefing in the next 48 hours. Second, whether Comer publicly references subpoena authority. Third, whether NASA, the FBI or the Department of Energy publish a written response of the type the Department of War already produced. Fourth, whether any further names are added to the missing or dead list, and on what evidence. Fifth, whether Burlison’s foreign-operation framing acquires any specific allegation tied to a named country, intelligence service or financial transfer.
The site will update the timeline with confirmed agency statements as they appear, and will produce a follow-up article when a substantive on-the-record response from any of the four agencies becomes available.