{
  "_note": "The wings map (binders.json \"map\": \"wings\"). geometry is the states file tools/build-maps.py writes (bump its ?v= when it changes). Plain text only: every string is escaped when rendered. Each wing has an id (its zoomed field is content/fields/<id>.json, written by tools/build-fields.py), one mark, the base itself (decimal degrees, base level), the counties its missile field spans, as the source names them, and (Warren, Minot) a footprint. footprint is GENERATED by tools/build-fields.py: the convex hull of the wing's flight outlines, drawn lightly shaded in the all-three view. A wing with no footprint (Malmstrom) shows its county extent, dotted. Neither is drawn inside a zoom (ruled 2026-09-25). polygon is GENERATED by tools/build-maps.py from counties (dissolved, generalized, rounded to 0.1 degree): edit counties and rerun, never the polygon. Flights, MAFs and LFs are in content/fields/, not here (ruled 2026-09-25).",
  "geometry": "assets/map/us-110m.json?v=1",
  "caption": "The three Minuteman III wings; tap one to zoom to its field. Each wing: the outer hull of its flights (their sources are in each field's caption).",
  "source": {
    "title": "Final Environmental Impact Statement, Sentinel (Ground Based Strategic Deterrent) Deployment and Minuteman III Decommissioning and Disposal, Volume I",
    "publisher": "Department of the Air Force, Air Force Global Strike Command",
    "date": "March 2023",
    "sections": "2.1.6.1 (F.E. Warren AFB), 2.1.7.1 (Malmstrom AFB), 2.1.8.1 (Minot AFB): Location and Overview",
    "url": "https://www.afgsc.af.mil/Portals/51/Docs/Sentinel/Sentinel%20FEIS%20-%20Volume%20I%20Final%20EIS%20March%202023.pdf",
    "archived_url": "https://web.archive.org/web/20231023160258/https://www.afgsc.af.mil/Portals/51/Docs/Sentinel/Sentinel%20FEIS%20-%20Volume%20I%20Final%20EIS%20March%202023.pdf",
    "accessed": "2026-09-24",
    "used_for": "base positions (base level)",
    "retired_use": "field extents (the counties each field spans, with the county outlines below), used until 2026-09-25, replaced by each wing's flight outlines",
    "county_outlines": "US Census Bureau, cartographic boundary file cb_2023_us_county_20m (2023), public domain"
  },
  "wings": [
    {
      "id": "malmstrom",
      "name": "341st Missile Wing, Malmstrom AFB, Montana",
      "label": "Malmstrom",
      "lat": 47.5,
      "lon": -111.2,
      "label_pos": "w",
      "field_sq_mi": 13800,
      "counties": [
        "MT:Cascade",
        "MT:Chouteau",
        "MT:Fergus",
        "MT:Judith Basin",
        "MT:Lewis and Clark",
        "MT:Meagher",
        "MT:Teton",
        "MT:Wheatland"
      ],
      "polygon": [[-111.4, 48.1], [-109.8, 48.3], [-109.5, 48.1], [-109.5, 47.7], [-109.0, 47.8], [-108.3, 47.6], [-108.3, 47.3], [-108.7, 47.3], [-108.6, 46.7], [-109.4, 46.8], [-109.4, 46.2], [-111.1, 46.2], [-111.1, 46.4], [-111.6, 46.8], [-111.6, 46.6], [-112.3, 46.4], [-112.3, 46.7], [-112.8, 46.8], [-112.8, 47.2], [-113.1, 47.2], [-113.2, 47.7], [-112.9, 48.0], [-113.0, 48.1], [-112.0, 48.0], [-111.4, 48.0]],
      "footprint": [[-112.54, 47.73], [-112.48, 47.44], [-112.38, 47.24], [-112.36, 47.23], [-109.87, 46.35], [-109.54, 46.28], [-109.52, 46.28], [-109.5, 46.29], [-108.77, 47.07], [-108.73, 47.42], [-108.73, 47.44], [-108.75, 47.45], [-109.33, 47.67], [-111.24, 47.86], [-111.54, 47.86], [-112.48, 47.84], [-112.5, 47.83], [-112.54, 47.75]]
    },
    {
      "id": "minot",
      "name": "91st Missile Wing, Minot AFB, North Dakota",
      "label": "Minot",
      "lat": 48.4,
      "lon": -101.4,
      "label_pos": "e",
      "field_sq_mi": 8500,
      "counties": [
        "ND:Bottineau",
        "ND:Burke",
        "ND:McHenry",
        "ND:McLean",
        "ND:Mountrail",
        "ND:Renville",
        "ND:Sheridan",
        "ND:Ward"
      ],
      "polygon": [[-101.5, 49.0], [-100.2, 49.0], [-100.3, 48.4], [-100.0, 47.3], [-100.7, 47.3], [-100.7, 47.2], [-101.0, 47.2], [-101.3, 47.3], [-101.4, 47.6], [-102.2, 47.6], [-102.3, 47.8], [-102.6, 47.8], [-102.6, 48.0], [-102.8, 48.1], [-102.9, 49.0]],
      "footprint": [[-102.63, 48.32], [-102.48, 47.97], [-101.97, 47.68], [-101.95, 47.67], [-101.77, 47.62], [-101.09, 47.57], [-101.06, 47.57], [-100.86, 47.58], [-100.42, 47.85], [-100.34, 47.93], [-100.34, 47.95], [-101.23, 48.98], [-101.25, 48.99], [-101.27, 48.99], [-102.25, 48.95], [-102.45, 48.92], [-102.47, 48.9], [-102.63, 48.33]]
    },
    {
      "id": "warren",
      "name": "90th Missile Wing, F.E. Warren AFB, Wyoming",
      "label": "F.E. Warren",
      "lat": 41.1,
      "lon": -104.9,
      "label_pos": "w",
      "field_sq_mi": 12600,
      "counties": [
        "CO:Logan",
        "CO:Weld",
        "NE:Banner",
        "NE:Cheyenne",
        "NE:Kimball",
        "WY:Goshen",
        "WY:Laramie"
      ],
      "polygon": [[-102.7, 41.0], [-102.7, 40.4], [-104.1, 40.5], [-104.2, 40.0], [-105.1, 40.0], [-104.9, 41.0], [-105.3, 41.0], [-105.3, 41.7], [-104.7, 41.7], [-104.7, 42.6], [-104.1, 42.6], [-104.1, 41.7], [-103.4, 41.7], [-103.4, 41.4], [-102.6, 41.4]],
      "footprint": [[-104.43, 41.19], [-104.09, 40.63], [-103.99, 40.55], [-103.52, 40.6], [-103.49, 40.61], [-102.67, 41.0], [-102.66, 41.07], [-102.65, 41.22], [-102.67, 41.34], [-102.88, 41.43], [-103.48, 41.67], [-103.68, 41.7], [-104.27, 41.69]]
    }
  ]
}