{
  "edition": "1.0",
  "evidence_cutoff": "2026-09-24T10:55:44Z",
  "sources": [
    {
      "id": "n01",
      "publisher": "U.S. Air Force / DoD",
      "title": "LGM-35A Sentinel Modernized Selected Acquisition Report, December 31, 2023",
      "document_date": "2023-12-31",
      "url": "https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20Room/Selected_Acquisition_Reports/FY_2023_SARS/LGM-35A_Sentinel_MSAR_Dec_2023.pdf",
      "pdf_page": 13,
      "locator": "PDF/printed pp. 8–11: breach history and original schedule; p. 13: constant-2020 and then-year acquisition estimates; pp. 16–17: unit-cost changes and revised indices; p. 21: EMD contract; p. 24: funding-summary inconsistency. The FY2025 budget report includes 2024 events despite its December 2023 label.",
      "access_note": "Reused the hash-checked official PDF retrieved September 12, 2026; fresh direct access returned 403. Schedule, cost, contract and expenditure tables inspected visually. This is a historical pre-recertification estimate, not the 2026 baseline.",
      "original_receipt": {
        "receipt_filename": "sentinel-msar-dec2023.pdf",
        "sha256": "33120fc7f70e89d78c43909e641aec04456c982c17e228aaac29413070915c62",
        "retrieved_at": "2026-09-12T13:56:01.629379+00:00"
      }
    },
    {
      "id": "n02",
      "publisher": "DoD News / U.S. Air Force",
      "title": "Department of Defense announces results of Sentinel Nunn-McCurdy Review",
      "document_date": "2024-07-08",
      "url": "https://www.af.mil/News/Features/Article/3830205/department-of-defense-announces-results-of-sentinel-nunn-mccurdy-review/",
      "locator": "Paragraphs on January 18 notification, certification, rescinded Milestone B, $140.9bn / 81% reported comparison, command-and-launch cost growth and estimated delay.",
      "access_note": "Reviewed the official publisher's indexed full article through web retrieval on September 24, 2026. Direct HTTPS retrieval was blocked; no successful raw-file download is claimed. The release does not explicitly label the dollar basis of its $140.9bn figure."
    },
    {
      "id": "n03",
      "publisher": "U.S. Government Accountability Office",
      "title": "Weapon Systems Annual Assessment — GAO-26-108457",
      "document_date": "2026-07-02",
      "url": "https://www.gao.gov/assets/gao-26-108457.pdf",
      "pdf_page": 103,
      "locator": "PDF pp. 103–104 / printed pp. 91–92, Sentinel assessment. January 2026 interim status; current cost row under review; altered first-flight scope, 2027 pad-based tests and Q3 FY2030 silo-based test; unresolved rebaseline and program-office targets.",
      "access_note": "Reused the hash-checked official PDF retrieved September 12; fresh direct PDF access failed. Both Sentinel pages were visually reviewed. July publication does not make its January assessment a September observation.",
      "original_receipt": {
        "receipt_filename": "gao-26-108457.pdf",
        "sha256": "f9afddd66fcaefe7c6f91dcf644a836a6b971fb792217c601cbc3d37adaac610",
        "retrieved_at": "2026-09-12T13:56:12.343318+00:00"
      }
    },
    {
      "id": "n04",
      "publisher": "Secretary of the Air Force Public Affairs",
      "title": "Delivering deterrence: Sentinel restructure to complete in 2026; initial capability timeline set",
      "document_date": "2026-02-17",
      "url": "https://www.af.mil/News/Article-Display/Article/4407679/delivering-deterrence-sentinel-restructure-to-complete-in-2026-initial-capabili/",
      "locator": "Opening and program-restructure paragraphs: new Milestone B targeted by end-2026; initial capability early 2030s. Progress bullets: ground-test article and component tests; not an operational declaration.",
      "access_note": "Reviewed the official publisher's indexed full article through web retrieval on September 24, 2026. Direct HTTPS retrieval was blocked; no successful raw-file download is claimed."
    },
    {
      "id": "n05",
      "publisher": "Secretary of the Air Force Public Affairs / Wright-Patterson AFB",
      "title": "Air Force assembles inert Sentinel missile, moving with pace toward flight testing",
      "document_date": "2026-09-14",
      "url": "https://www.wpafb.af.mil/News/Article-Display/Article/4601501/air-force-assembles-inert-sentinel-missile-moving-with-pace-toward-flight-testi/",
      "locator": "Opening, first-flight design-review paragraph and final paragraph: inert vertical assembly after a four-month campaign, first-flight-specific review, planned 2027 flight testing and early-2030s initial capability.",
      "access_note": "Reviewed the official publisher's indexed full article through web retrieval on September 24, 2026. Direct HTTPS retrieval was blocked; no successful raw-file download is claimed. September 14 is publication; an exact assembly-completion date is not assigned."
    },
    {
      "id": "n06",
      "publisher": "Office of the Under Secretary of Defense (Comptroller)",
      "title": "FY2027 RDT&E Programs (R-1)",
      "document_date": "2026-04",
      "url": "https://comptroller.war.gov/Portals/45/Documents/defbudget/FY2027/FY2027_r1.pdf",
      "pdf_page": 47,
      "locator": "PDF p. 47 / printed p. 42: 3600F, line 102, PE 0605238F, Ground Based Strategic Deterrent EMD. FY2025 Actuals; FY2026 discretionary enacted / P.L.119-21 spend plan / total; FY2027 discretionary request. All values in $thousands.",
      "access_note": "Fresh direct PDF retrieval succeeded September 24. Column labels and the entire line were visually inspected. This is a total-obligational-authority exhibit, not an outlay ledger.",
      "original_receipt": {
        "receipt_filename": "r1.pdf",
        "sha256": "1aa8846edb69d4c3a54e03b383b0cabb77f93433162b8139ab8cbb55bcc7882a",
        "retrieved_at": "2026-09-24T10:52:29.737811+00:00"
      }
    },
    {
      "id": "n07",
      "publisher": "U.S. Department of Defense (historical release hosted on war.gov)",
      "title": "Contracts for September 8, 2020",
      "document_date": "2020-09-08",
      "url": "https://www.war.gov/News/Contracts/Contract/Article/2340084/source/news_body_link/",
      "locator": "AIR FORCE, first paragraph: FA8219-20-C-0006, $13,293,562,839 cost-plus-incentive-fee award, $85m FY2020 RDT&E obligation, one offer and February 2029 estimated completion.",
      "access_note": "Reviewed the official publisher's indexed full article through web retrieval on September 24, 2026. Direct HTTPS retrieval was blocked; no successful raw-file download is claimed. Historical award terms, not the current contract balance."
    },
    {
      "id": "n08",
      "publisher": "U.S. Department of War",
      "title": "Contracts for June 10, 2026",
      "document_date": "2026-06-10",
      "url": "https://www.war.gov/News/Contracts/Contract/Article/4513990/contracts-for-june-10-2026/",
      "locator": "ARMY, Korte Construction paragraph: W912PL-26-C-A005, $113,852,388 firm-fixed-price FTU construction contract; same FY2025 MILCON defense-wide obligation; March 6, 2029 estimated completion.",
      "access_note": "Reviewed the official publisher's indexed full article through web retrieval on September 24, 2026. Direct HTTPS retrieval was blocked; no successful raw-file download is claimed. The funding fiscal year is not the award year; completion is a forecast."
    },
    {
      "id": "n09",
      "publisher": "Secretary of the Air Force Public Affairs",
      "title": "Sentinel Program advances with silo prototype",
      "document_date": "2026-03-27",
      "url": "https://www.af.mil/News/Article-Display/Article/4445731/sentinel-program-advances-with-silo-prototype/",
      "locator": "Opening and prototype-purpose paragraphs: groundbreaking for a full-scale silo prototype; new-silo approach rather than refurbishment; anticipated construction learning.",
      "access_note": "Reviewed the official publisher's indexed full article through web retrieval on September 24, 2026. Direct HTTPS retrieval was blocked; no successful raw-file download is claimed. A prototype groundbreaking is not completed infrastructure or demonstrated cost savings."
    },
    {
      "id": "n10",
      "publisher": "90th Missile Wing Public Affairs / Air Force Global Strike Command",
      "title": "Sentinel utility corridor project commences with groundbreaking event",
      "document_date": "2026-07-23",
      "url": "https://www.afgsc.af.mil/News/Article-Display/Article/4557972/sentinel-icbm-programs-utility-corridor-project-commences-with-golden-shovel-gr/",
      "locator": "Opening and photo captions: June 24, 2026 groundbreaking for utility-corridor pilot. July 23 is this mirror's publication label; other official mirrors list July 22.",
      "access_note": "Reviewed the official publisher's indexed full article through web retrieval on September 24, 2026. Direct HTTPS retrieval was blocked; no successful raw-file download is claimed. Reports construction beginning, not a completed network."
    },
    {
      "id": "n11",
      "publisher": "Air Force Nuclear Weapons Center / Staff Sgt. An Pham",
      "title": "Officials break ground on AETC's Sentinel training unit at Vandenberg SFB",
      "document_date": "2026-09-01",
      "url": "https://www.afnwc.af.mil/News/Article-Display/Article/4590790/officials-break-ground-on-aetcs-sentinel-training-unit-at-vandenberg-sfb/",
      "locator": "Opening: August 17 groundbreaking. Closing facility paragraph: opening slated for early 2030s. This is not the March 2029 contract completion forecast in N08.",
      "access_note": "Reviewed the official publisher's indexed full article through web retrieval on September 24, 2026. Direct HTTPS retrieval was blocked; no successful raw-file download is claimed. No source reviewed reconciles contract completion with operational opening; do not treat them as equivalent dates."
    },
    {
      "id": "n12",
      "publisher": "U.S. Government Accountability Office",
      "title": "Intercontinental Ballistic Missile Modernization Faces Critical Risks and Opportunities — GAO-26-108755",
      "document_date": "2026-02-18",
      "url": "https://www.gao.gov/assets/gao-26-108755.pdf",
      "pdf_page": 1,
      "locator": "PDF p. 1: rescinded Milestone B and baselines, at-least-$141bn uncertain estimate, prior March 2028 first-flight plan. P. 2: transition risk-management and extended Minuteman III sustainment findings.",
      "access_note": "Official PDF text reviewed through web retrieval; direct PDF download and screenshots failed. Earlier first-flight scope is clarified by the later annual assessment N03."
    }
  ]
}