feat(military): render on Navara

Task 11b. src/layers/military/render/navara.js: the shared Navara aircraft
renderer with the military's sprite slot (SPRITE_LAYER_ORDER 'military',
under flights) and jet.glb's nose offset; registered by
registerNavaraLayerRenderers (now a table of lazily imported factories,
flights and military), so the Navara catalog offers military and the main
chunk stays without three/Navara.

- The follow passes between aircraft layers on Navara as on Cesium: the
  follow-handle → tracked-handle map and the "follow being started" handle
  are shared by every aircraft renderer of the page, so a layer whose follow
  another layer took reads the new owner's tracked handle (and its
  gevSelectionOrigin) — before, it read a bare follow handle and reported
  'programmatic'.
- trackById on a selected-but-not-followed contact follows it again (as
  flights since 10b; on Navara any camera command ends a follow).
- qaDrawn (the probe's drawn()) for military, shared with flights
  (src/layers/aircraft/qaDrawn.js).
- ?qaFeed=military:synthetic[:count]: seeded readsb rows (1 000 by
  default, 150 near JFK, 12 on the ground, 8 types), the first 25 hexes
  shared with the synthetic civil flights.
- qa-w1-layers: sections 4–6 read the --layer's module (were 'flights');
  section 5 keeps the queries beside the voice answers (the voice block
  overwrote them, so --compare never compared queries); for military: the
  follow passes military → flights → military, and flights leaves the 25
  shared aircraft to military while it is on (9 975 / 10 000 / 9 975).

qa-w1-layers --layer=military: Cesium 25/25, Navara 26/26, --compare parity
(queries included; the known 2.3 px camera offset at the global pose only).

scripts/format-scope.json

@@ -352,6 +352,9 @@
   "src/layers/military/queries.js",
   "src/layers/military/index.js",
   "src/layers/military/render/cesium.js",
+  "src/layers/military/render/navara.js",
+  "src/layers/aircraft/qaDrawn.js",
+  "src/app/navaraLayers.test.mjs",
   "src/layers/aircraft/index.js",
   "src/layers/aircraft/classification.js",
   "src/layers/military/ownership.test.mjs",

scripts/package-boundaries.json

@@ -897,7 +897,8 @@
       "src/time/clock.js",
       "src/globe/contract.js",
       "src/globe/cesium/engineFromViewer.js",
-      "src/layers/shared/color.js"
+      "src/layers/shared/color.js",
+      "src/layers/aircraft/qaDrawn.js"
     ],
     "external": ["cesium"]
   },
@@ -954,7 +955,8 @@
       "src/geo/developerError.js",
       "src/time/clock.js",
       "src/globe/contract.js",
-      "src/globe/cesium/engineFromViewer.js"
+      "src/globe/cesium/engineFromViewer.js",
+      "src/layers/aircraft/qaDrawn.js"
     ],
     "external": ["cesium"]
   },
@@ -2596,7 +2598,9 @@
       "src/data/selectionDispatcher.js",
       "src/layers/shared/color.js",
       "src/layers/aircraft/render/navara.js",
-      "src/layers/flights/render/navara.js"
+      "src/layers/flights/render/navara.js",
+      "src/layers/military/render/navara.js",
+      "src/layers/aircraft/qaDrawn.js"
     ],
     "external": [
       "hls.js",
@@ -3172,7 +3176,8 @@
       "src/data/selectionDispatcher.js",
       "src/layers/shared/color.js",
       "src/layers/flights/render/cesium.js",
-      "src/layers/military/render/cesium.js"
+      "src/layers/military/render/cesium.js",
+      "src/layers/aircraft/qaDrawn.js"
     ],
     "external": [
       "hls.js",

src/app/layers/qaSources.js

@@ -5,16 +5,24 @@
 // shape. Times are relative to now, so the objects stay fresh.
 //
 //   flights:synthetic[:count]   OpenSky states, `count` aircraft (8 000)
+//   military:synthetic[:count]  readsb rows, `count` aircraft (1 000); the
+//                               first 25 are also synthetic civil flights
 //   vessels:fixture             12 000 AIS rows, or those within an area
 
 import {
   createFlightSource,
+  createMilitarySource,
   createVesselSource,
 } from '../../sources/live/standalone.js';
-import { syntheticFlights, syntheticVessels } from '../../bench/w1Feeds.js';
+import {
+  syntheticFlights,
+  syntheticMilitary,
+  syntheticVessels,
+} from '../../bench/w1Feeds.js';
 
 const KINDS = Object.freeze({
   flights: new Set(['synthetic']),
+  military: new Set(['synthetic']),
   vessels: new Set(['fixture']),
 });
 
@@ -30,7 +38,7 @@ export function parseQaFeed(search = '') {
       (count !== null && !(Number.isInteger(count) && count > 0))
     )
       throw new TypeError(
-        `qaFeed: unknown entry "${item}" (flights:synthetic[:count], vessels:fixture)`,
+        `qaFeed: unknown entry "${item}" (flights:synthetic[:count], military:synthetic[:count], vessels:fixture)`,
       );
     return { layer, kind, count };
   });
@@ -52,6 +60,14 @@ export function createQaSources(entries, { now = () => Date.now() } = {}) {
         fetchImpl: async () =>
           json(syntheticFlights({ nowMs: now(), count: count ?? 8000 })),
       });
+    if (layer === 'military')
+      sources.military = createMilitarySource({
+        now,
+        fetchImpl: async (url) =>
+          String(url).includes('/track')
+            ? json({ timestamp: now() / 1000, trace: [] })
+            : json(syntheticMilitary({ nowMs: now(), count: count ?? 1000 })),
+      });
     if (layer === 'vessels')
       sources.vessels = createVesselSource({
         fetchImpl: async (url) => {

src/app/layers/qaSources.test.mjs

@@ -42,3 +42,24 @@ test('fixture sources answer with the live sources’ snapshot shape', async ()
   assert.ok(near.records.length > 10 && near.records.length < 12000);
   assert.deepEqual(createQaSources([]), {});
 });
+
+test('military:synthetic answers with the military source’s shape, some shared with flights', async () => {
+  const now = Date.UTC(2026, 9, 16, 12);
+  const sources = createQaSources(
+    parseQaFeed('?qaFeed=military:synthetic:300,flights:synthetic:500'),
+    { now: () => now },
+  );
+  const military = await sources.military.getSnapshot({});
+  assert.equal(military.records.length, 300);
+  assert.ok(military.records.some((record) => record.onGround));
+  assert.ok(military.records.every((record) => record.typeCode));
+  const identities = await sources.military.getIdentities({});
+  assert.ok(identities.records?.length ?? identities.length);
+  const civil = new Set(
+    (await sources.flights.getSnapshot({})).records.map(({ id }) => id),
+  );
+  const shared = military.records.filter(({ id }) => civil.has(id));
+  assert.equal(shared.length, 25);
+  const track = await sources.military.getTrack('ae1100');
+  assert.deepEqual(track.records, []);
+});

src/app/navaraLayers.test.mjs

@@ -0,0 +1,29 @@
+// The layers the Navara mode draws (registerNavaraLayerRenderers): each W1
+// layer with a Navara renderer, registered once, through import().
+
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { registerNavaraLayerRenderers } from './navaraMode.js';
+import {
+  createLayerAvailability,
+  layerAvailableOn,
+  rendererFor,
+} from './layers/renderers.js';
+
+test('the Navara mode registers the flights and military renderers, once', async () => {
+  assert.equal(layerAvailableOn('military', 'navara'), false);
+  await Promise.all([
+    registerNavaraLayerRenderers(),
+    registerNavaraLayerRenderers(),
+  ]);
+  await registerNavaraLayerRenderers();
+  for (const id of ['flights', 'military'])
+    assert.equal(layerAvailableOn(id, 'navara'), true, id);
+  assert.deepEqual(
+    createLayerAvailability('navara')
+      .available()
+      .map(({ id }) => id),
+    ['flights', 'military'],
+  );
+  assert.equal(rendererFor('satellites', { kind: 'navara' }), null);
+});

src/app/navaraMode.js

@@ -54,11 +54,26 @@ const SHELL_CREDIT_KEYS = new Set([
  * here, through import(), so Cesium mode never fetches them.
  */
 export async function registerNavaraLayerRenderers() {
-  if (layerAvailableOn('flights', 'navara')) return;
+  const loaders = {
-  const { createFlightsNavaraRenderer } =
+    flights: async () =>
-    await import('../layers/flights/render/navara.js');
+      (await import('../layers/flights/render/navara.js'))
-  if (!layerAvailableOn('flights', 'navara'))
+        .createFlightsNavaraRenderer,
-    registerLayerRenderers('navara', { flights: createFlightsNavaraRenderer });
+    military: async () =>
+      (await import('../layers/military/render/navara.js'))
+        .createMilitaryNavaraRenderer,
+  };
+  const missing = Object.keys(loaders).filter(
+    (id) => !layerAvailableOn(id, 'navara'),
+  );
+  if (!missing.length) return;
+  const factories = await Promise.all(missing.map((id) => loaders[id]()));
+  // A concurrent call may have registered some meanwhile.
+  const fresh = Object.fromEntries(
+    missing
+      .map((id, index) => [id, factories[index]])
+      .filter(([id]) => !layerAvailableOn(id, 'navara')),
+  );
+  if (Object.keys(fresh).length) registerLayerRenderers('navara', fresh);
 }
 
 /**

src/bench/w1Feeds.js

@@ -1,5 +1,5 @@
 // Seeded synthetic feed answers: the global /api/flights snapshot (OpenSky
-// states), 12 000 AIS vessels on /api/vessels (with and without an area) and
+// states), the /api/military snapshot (readsb rows), 12 000 AIS vessels on /api/vessels (with and without an area) and
 // the local receivers' 1090 MHz and 978 MHz UAT aircraft near JFK, timed
 // relative to one instant, so every run sees the same objects at the same
 // places. Pure: Node and browser, no I/O. Used by the W1 baseline recordings
@@ -123,6 +123,66 @@ export function syntheticVessels({
   return { rows, newestPositionAt: nowMs };
 }
 
+// Military types across the weight classes (data/aircraftClass): heavies,
+// fast jets, helicopters, tankers, patrol.
+const MILITARY_TYPES = [
+  ['C17', 'RCH'],
+  ['F16', 'VIPER'],
+  ['KC135', 'PACK'],
+  ['H60', 'DUSTY'],
+  ['C130', 'HERKY'],
+  ['P8', 'PELCN'],
+  ['E3TF', 'SENTRY'],
+  ['MQ9', 'REAPER'],
+];
+
+/**
+ * The /api/military answer (readsb rows): `count` aircraft, 150 of them near
+ * JFK (12 on the ground there), the rest worldwide. The first `overlap`
+ * hexes are also civil synthetic flights (a00000…), which the flights layer
+ * leaves to this layer while it is on (duplicate suppression).
+ */
+export function syntheticMilitary({
+  nowMs = W1_FROZEN_MS,
+  count = 1_000,
+  seed = 41,
+  overlap = 25,
+} = {}) {
+  const random = mulberry32(seed);
+  const near = Math.min(150, count);
+  const ac = [];
+  for (let index = 0; index < count; index++) {
+    const [type, call] = MILITARY_TYPES[index % MILITARY_TYPES.length];
+    const nearJfk = index < near;
+    const grounded = nearJfk && index % 12 === 5;
+    const lat = nearJfk
+      ? JFK.lat + (random() - 0.5) * (grounded ? 0.01 : 1.0)
+      : random() * 140 - 70;
+    const lon = nearJfk
+      ? JFK.lng + (random() - 0.5) * (grounded ? 0.01 : 1.3)
+      : random() * 360 - 180;
+    ac.push({
+      hex:
+        index < overlap ? hex(0xa00000 + index, 6) : hex(0xae1000 + index, 6),
+      type: 'adsb_icao',
+      flight: `${call}${String(index % 100).padStart(2, '0')}`.padEnd(8),
+      r: `${10_000 + index}`,
+      t: type,
+      alt_baro: grounded ? 'ground' : Math.round(2_000 + random() * 33_000),
+      gs: grounded
+        ? Math.round(random() * 12)
+        : Math.round(160 + random() * 330),
+      track: Math.round(random() * 3600) / 10,
+      baro_rate: 0,
+      lat: Number(lat.toFixed(5)),
+      lon: Number(lon.toFixed(5)),
+      seen_pos: Number((random() * 2).toFixed(1)),
+      seen: 0,
+    });
+  }
+  return { ac, now: nowMs / 1000, total: ac.length, msg: 'No error' };
+}
+
 /** The /api/local-receivers/aircraft answer: 1090 MHz and 978 MHz UAT aircraft. */
 export function syntheticLocalReceivers({
   nowMs = W1_FROZEN_MS,

src/layers/aircraft/qaDrawn.js

@@ -0,0 +1,49 @@
+// What an aircraft layer draws, as plain data (QA: the engine-neutral probe,
+// window.__godsEyeView.layers.drawn): per contact its glyph (image, scale,
+// shown, screen rotation, alpha, position) and its 3D model, read from the
+// renderer's handles — the same on every engine. Shared by the aircraft
+// layers (flights, military).
+
+/**
+ * @param {object} state The layer's state: `_billboards` (id → sprite
+ *   handle), `_models` (id → model handle), `_trackedIcao`, `_trackedModel`.
+ * @returns {Array<object>}
+ */
+export function aircraftQaDrawn(state) {
+  const out = [];
+  for (const [id, sprite] of state._billboards) {
+    const model = state._models.get(id);
+    out.push({
+      id,
+      tracked: id === state._trackedIcao,
+      image: sprite.image,
+      scale: sprite.scale,
+      width: sprite.width,
+      show: sprite.show,
+      rotation: sprite.rotation,
+      alpha: sprite.color?.alpha ?? null,
+      position: sprite.position
+        ? {
+            x: sprite.position.x,
+            y: sprite.position.y,
+            z: sprite.position.z,
+          }
+        : null,
+      model: model
+        ? { scale: model.scale, show: model.show, ready: model.ready }
+        : null,
+    });
+  }
+  const tracked = state._trackedModel;
+  if (state._trackedIcao && tracked)
+    out.push({
+      id: state._trackedIcao,
+      trackedModel: true,
+      model: {
+        scale: tracked.scale,
+        show: tracked.show,
+        ready: tracked.ready,
+      },
+    });
+  return out;
+}

src/layers/aircraft/render/navara.js

@@ -189,6 +189,16 @@ const scalarKey = (scalar) =>
     ? `${scalar.near},${scalar.nearValue},${scalar.far},${scalar.farValue}`
     : 'none';
 
+// Follow handle → the tracked handle it follows, for every aircraft layer on
+// the engine: a layer whose follow another aircraft layer took reads the
+// new owner's tracked handle (its gevSelectionOrigin), as Cesium's
+// viewer.trackedEntity gives it the other layer's entity.
+const FOLLOWED_TRACKED = new WeakMap();
+// The tracked handle whose follow is being started (any aircraft layer):
+// the engine raises followChanged inside follow(), before the follow
+// handle is known, and every layer's listener must see the new owner.
+let followStarting = null;
+
 // ---------------------------------------------------------------------------
 // The renderer
 // ---------------------------------------------------------------------------
@@ -849,7 +859,7 @@ export function createAircraftNavaraRenderer({
   };
 
   // --- follow ---------------------------------------------------------------
-  const ownFollows = new WeakMap(); // follow handle → tracked handle
+  const ownFollows = FOLLOWED_TRACKED; // follow handle → tracked handle
   // The follow carries the tracked readout's card as plain data (the
   // handle's annotation fields, read when the card paints).
   const followOf = (handle) => {
@@ -864,17 +874,15 @@ export function createAircraftNavaraRenderer({
       label: card,
     });
   };
-  // The tracked handle whose follow is being started: the engine raises
-  // followChanged inside follow(), before the handle is known here.
-  let starting = null;
   const follow = {
     start(handle) {
-      starting = handle;
+      const outer = followStarting;
+      followStarting = handle;
       let followHandle;
       try {
         followHandle = followOf(handle);
       } finally {
-        starting = null;
+        followStarting = outer;
       }
       handle.gevFollowHandle = followHandle;
       ownFollows.set(followHandle, handle);
@@ -892,7 +900,7 @@ export function createAircraftNavaraRenderer({
       Boolean(handle?.gevFollowHandle) &&
       engine.camera.following() === handle.gevFollowHandle,
     current() {
-      if (starting) return starting;
+      if (followStarting) return followStarting;
       const handle = engine.camera.following();
       return handle ? (ownFollows.get(handle) ?? handle) : undefined;
     },

src/layers/flights/queries.js

@@ -1,4 +1,5 @@
 import { approxDistanceKm as _approxDistanceKm } from './recordPolicy.js';
+import { aircraftQaDrawn } from '../aircraft/qaDrawn.js';
 import { displayedKinematics } from '../../data/motionModel.js';
 import * as geo from '../../geo/index.js';
 import { isExplicitLayerStateOrigin } from '../../data/layerState.js';
@@ -817,42 +818,7 @@ export function createQueries({
      * @returns {Array<object>}
      */
     qaDrawn() {
-      const out = [];
+      return aircraftQaDrawn(flightState);
-      for (const [id, sprite] of flightState._billboards) {
-        const model = flightState._models.get(id);
-        out.push({
-          id,
-          tracked: id === flightState._trackedIcao,
-          image: sprite.image,
-          scale: sprite.scale,
-          width: sprite.width,
-          show: sprite.show,
-          rotation: sprite.rotation,
-          alpha: sprite.color?.alpha ?? null,
-          position: sprite.position
-            ? {
-                x: sprite.position.x,
-                y: sprite.position.y,
-                z: sprite.position.z,
-              }
-            : null,
-          model: model
-            ? { scale: model.scale, show: model.show, ready: model.ready }
-            : null,
-        });
-      }
-      const tracked = flightState._trackedModel;
-      if (flightState._trackedIcao && tracked)
-        out.push({
-          id: flightState._trackedIcao,
-          trackedModel: true,
-          model: {
-            scale: tracked.scale,
-            show: tracked.show,
-            ready: tracked.ready,
-          },
-        });
-      return out;
     },
 
     /**

src/layers/military/queries.js

@@ -1,4 +1,5 @@
 import { displayedKinematics } from '../../data/motionModel.js';
+import { aircraftQaDrawn } from '../aircraft/qaDrawn.js';
 import * as geo from '../../geo/index.js';
 import { isExplicitLayerStateOrigin } from '../../data/layerState.js';
 import { aircraftIncludedInNearby } from '../../data/aircraftNearbyPolicy.js';
@@ -640,8 +641,18 @@ export function createQueries({
       if (!flightState._billboards.has(id)) return false;
       if (parts.tracking._isExplicitTrackingOrigin(origin))
         parts.tracking._cancelPendingTrackingRestore();
-      if (flightState._trackedIcao === id)
+      if (flightState._trackedIcao === id) {
+        // Selected but no longer followed (a camera command took the camera:
+        // a search flight, the startup view; on Navara any command ends a
+        // follow): asking to track it again follows it again (as flights).
+        const entity = flightState._trackedEntity;
+        if (entity && !flightState._renderer?.follow.isFollowing(entity)) {
+          flightState._trackedCameraFrameStop?.();
+          flightState._trackedCameraFrameStop =
+            flightState._renderer.follow.refocus(entity);
+        }
         return parts.tracking._publishTrackedSelection(id, origin);
+      }
       parts.tracking._trackFlight(id, { origin });
       return true;
     },
@@ -720,6 +731,16 @@ export function createQueries({
       return true;
     },
 
+    /**
+     * What this layer draws, as plain data (QA: the engine-neutral probe,
+     * window.__godsEyeView.layers.drawn): per contact its glyph and its 3D
+     * model, read from the renderer's handles — the same on every engine.
+     * @returns {Array<object>}
+     */
+    qaDrawn() {
+      return aircraftQaDrawn(flightState);
+    },
+
     /**
      * Stop tracking the currently followed aircraft (no-op if none).
      * @returns {boolean} Always true.

src/layers/military/render/navara.js

@@ -0,0 +1,22 @@
+// The military flights layer's renderer on the Navara engine: the shared
+// aircraft renderer (src/layers/aircraft/render/navara.js) with the
+// military's sprite slot (data/spriteOrder's order on Cesium) and jet.glb's
+// nose offset. Registered for 'navara' by the Navara mode after its
+// import() (src/app/navaraMode.js).
+
+import { createAircraftNavaraRenderer } from '../../aircraft/render/navara.js';
+import { SPRITE_LAYER_ORDER } from '../../../data/spriteOrder.js';
+import { MODEL_HEADING_OFFSET_DEG } from '../policy.js';
+
+/**
+ * Registry factory (src/app/layers/renderers.js): `(engine, options)`.
+ * @param {import('../../../globe/contract.js').GlobeEngine} engine
+ */
+export function createMilitaryNavaraRenderer(engine) {
+  return createAircraftNavaraRenderer({
+    engine,
+    layerId: 'military',
+    order: SPRITE_LAYER_ORDER.indexOf('military'),
+    headingOffsetDeg: MODEL_HEADING_OFFSET_DEG,
+  });
+}

src/layers/military/renderer.test.mjs

@@ -140,3 +140,155 @@ test('the military logic draws, selects and follows only through its renderer',
   assert.ok(renderer.calls.some(([name]) => name === 'destroy'));
   assert.equal(keyListeners.size, 0, 'the dispatcher left the keyboard');
 });
+
+test('the military logic draws and follows on the Navara renderer; the follow passes between flights and military', async () => {
+  const { createAircraftNavaraRenderer, aircraftAtlasLayout } =
+    await import('../aircraft/render/navara.js');
+  const { createApplicationFlights } =
+    await import('../../app/layers/flights.js');
+  const { openSkySnapshot } = await import('../../sources/live/aircraft.js');
+  const layout = aircraftAtlasLayout();
+  const drawAtlas = async () => ({
+    canvas: { width: layout.width, height: layout.height },
+    cells: layout.cells,
+  });
+  const engine = createFakeEngine();
+  const renderers = {};
+  const navara = (layerId, order) => ({
+    create: ({ engine: given }) =>
+      (renderers[layerId] = createAircraftNavaraRenderer({
+        engine: given,
+        layerId,
+        order,
+        headingOffsetDeg: 180,
+        drawAtlas,
+      })),
+  });
+  const military = createApplicationMilitary({
+    surface: defaultSurface,
+    source: {
+      label: 'Fixture military',
+      getSnapshot: async () => militarySnapshotOf(['ae0001', 'ae0002']),
+    },
+    militaryRegistry,
+    renderer: navara('military', 7),
+  });
+  const nowSec = Math.floor(Date.now() / 1000);
+  const flights = createApplicationFlights({
+    surface: defaultSurface,
+    source: {
+      label: 'Fixture aircraft',
+      getSnapshot: async () =>
+        openSkySnapshot({
+          time: nowSec,
+          states: [
+            [
+              'abc123',
+              'TST0 ',
+              'United States',
+              nowSec,
+              nowSec,
+              -97.9,
+              30.4,
+              10_668,
+              false,
+              250,
+              95,
+              5,
+              null,
+              10_700,
+              null,
+              null,
+              null,
+              5,
+            ],
+          ],
+        }),
+    },
+    militaryRegistry,
+    renderer: navara('flights', 8),
+  });
+  military.init(null, { engine });
+  flights.init(null, { engine });
+  military.enable();
+  flights.enable();
+  const awareness = [];
+  const listen = (event) => awareness.push([event.type, event.detail]);
+  const realDispatch = globalThis.window.dispatchEvent;
+  globalThis.window.dispatchEvent = (event) => {
+    listen(event);
+    return true;
+  };
+  try {
+    await renderers.military.whenReady();
+    await renderers.flights.whenReady();
+    await military.update(null);
+    await flights.update(null);
+    await Promise.resolve();
+    const sprites = engine.movers
+      .list()
+      .filter(({ id }) => id.startsWith('military-sprites'));
+    assert.equal(sprites.length, 1);
+    assert.equal(sprites[0].count, 2);
+    const drawn = military.qaDrawn();
+    assert.deepEqual(drawn.map((row) => row.id).sort(), ['ae0001', 'ae0002']);
+    // The fleet's colour reaches the engine as the layer's amber.
+    const { store } = engine.fake.moverSet(sprites[0].id);
+    assert.deepEqual([...store.pickIds.slice(0, 2)].sort(), [
+      'ae0001',
+      'ae0002',
+    ]);
+
+    // A click on a military contact selects it; the engine follows.
+    engine.fake.script('pick', () => ({ id: 'ae0002' }));
+    engine.fake.script('drillPick', () => [{ id: 'ae0002' }]);
+    click(engine);
+    assert.equal(military.getTrackedInfo()?.icao24, 'ae0002');
+    assert.equal(engine.camera.following()?.label?.id, 'military:ae0002');
+    engine.fake.frame();
+    assert.equal(
+      engine.movers.list().find(({ id }) => id.startsWith('military-tracked'))
+        .count,
+      1,
+    );
+
+    // A click on a civil flight takes the follow: military lets go, with
+    // the new owner's origin (as Cesium's trackedEntityChanged gives it).
+    engine.fake.script('pick', () => ({ id: 'abc123' }));
+    engine.fake.script('drillPick', () => [{ id: 'abc123' }]);
+    click(engine);
+    assert.equal(flights.getTrackedInfo()?.icao24, 'abc123');
+    assert.equal(military.getTrackedInfo(), null);
+    assert.equal(engine.camera.following()?.label?.id, 'flights:abc123');
+    const cleared = awareness.find(
+      ([type, detail]) =>
+        type === 'gev:awareness-subject-cleared' &&
+        detail.layerId === 'military',
+    );
+    assert.equal(cleared?.[1].origin, 'user');
+
+    // And back: tracking a military contact by voice releases flights.
+    assert.equal(military.trackById('ae0001', { origin: 'voice' }), true);
+    assert.equal(flights.getTrackedInfo(), null);
+    assert.equal(engine.camera.following()?.label?.id, 'military:ae0001');
+
+    // A camera command ends the follow; tracking it again follows it again.
+    engine.camera.setView({
+      destination: engine.camera.pose().position,
+    });
+    assert.equal(engine.camera.following(), null);
+    assert.equal(military.getTrackedInfo()?.icao24, 'ae0001');
+    assert.equal(military.trackById('ae0001', { origin: 'voice' }), true);
+    assert.equal(engine.camera.following()?.label?.id, 'military:ae0001');
+    assert.equal(military.stopTracking(), true);
+    assert.equal(engine.camera.following(), null);
+  } finally {
+    globalThis.window.dispatchEvent = realDispatch;
+    flights.disable();
+    military.disable();
+    flights.destroy(null);
+    military.destroy(null);
+  }
+  assert.equal(engine.movers.list().length, 0, 'no mover set left behind');
+  engine.destroy();
+});