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In contrast to GeoPackage data, for example, the supported military symbology standards do not define a data format for storing military symbologies. As such, we cannot create the model from disk using a model decoder. Instead, we create the IFeatureModelIFeatureModelIFeatureModel through code.

In this example, we create a military symbology model containing a single symbol:

// Create the coordinate reference in which the model will be defined.
auto crs = TestCrs::epsg4326();

// Create an APP-6 symbol "unmanned aerial vehicle unit" and set a value for its text modifier "Unique Designation".
auto symbol = MilitarySymbol::create(MilitarySymbology::Standard::App6d, "10060100001103000000");
symbol->putValue(MilitarySymbol::Modifier::UniqueDesignation, "Regular");

// Copy the symbol to a Feature instance and a point geometry.
Feature emptyFeature = Feature::newBuilder().dataType(MilitaryDataModel::getSymbolType()).build();
auto featureGeometry = GeometryFactory::createPoint(crs, 0, 27, 46);
auto feature = symbol->copyToFeature(emptyFeature, featureGeometry);

// Declare the model metadata.
auto modelMetadata = ModelMetadata::newBuilder().title("My Symbology Model").build();
auto featureModelMetadata = FeatureModelMetadata::newBuilder().dataModel(MilitaryDataModel::get()).reference(crs).build();
auto modelBounds = GeometryFactory::createBounds(crs, featureGeometry->getLocation(), 0, 0, 0);

// Build an IFeatureModel containing only the feature we just created.
auto militarySymbologyModel = FeatureModelBuilder::newBuilder()
                                  .modelMetadata(modelMetadata)
                                  .featureModelMetadata(featureModelMetadata)
                                  .bounds(modelBounds)
                                  .features({feature})
                                  .build();
// Finally, put the model in a layer, and add it to the map.
// A default IFeaturePainter is automatically deduced from the model's data model.
auto layer = FeatureLayer::newBuilder().model(militarySymbologyModel).build();
map->getLayerList()->add(layer);

// Create the coordinate reference in which the model will be defined.
var crs = CoordinateReferenceProvider.Create("EPSG:4326");

// Create an APP-6 symbol "unmanned aerial vehicle unit" and set a value for its text modifier "Unique Designation".
var symbol = MilitarySymbol.Create(MilitarySymbology.Standard.App6d, "10060100001103000000");
symbol.PutValue(MilitarySymbol.Modifier.UniqueDesignation, "Regular");

// Copy the symbol to a Feature instance and a point geometry.T
Feature emptyFeature = Feature.NewBuilder().DataType(MilitaryDataModel.SymbolType).Build();
var featureGeometry = GeometryFactory.CreatePoint(crs, 0, 27, 46);
var feature = symbol.CopyToFeature(emptyFeature, featureGeometry);

// Declare the model metadata.
var modelMetadata = ModelMetadata.NewBuilder().Title("My Symbology Model").Build();
var featureModelMetadata = FeatureModelMetadata.NewBuilder().DataModel(MilitaryDataModel.Get()).Reference(crs).Build();
var modelBounds = GeometryFactory.CreateBounds(crs, featureGeometry.Location, 0, 0, 0);

// Build an IFeatureModel containing only the feature we just created.
var militarySymbologyModel = FeatureModelBuilder.NewBuilder()
    .ModelMetadata(modelMetadata)
    .FeatureModelMetadata(featureModelMetadata)
    .Bounds(modelBounds)
    .Features(new List<Feature> { feature })
    .Build();

// Finally, put the model in a layer, and add it to the map.
// A default IFeaturePainter is automatically deduced from the model's data model.
var layer = FeatureLayer.NewBuilder().Model(militarySymbologyModel).Build();
map.LayerList.Add(layer);

// Create the coordinate reference in which the model will be defined.
CoordinateReference crs = CoordinateReferenceProvider.create("EPSG:4326");

// Create an APP-6 symbol "unmanned aerial vehicle unit" and set a value for its text modifier "Unique Designation".
MilitarySymbol symbol = MilitarySymbol.create(MilitarySymbology.Standard.App6d, "10060100001103000000");
symbol.putValue(MilitarySymbol.Modifier.UniqueDesignation, "Regular");

// Copy the symbol to a Feature instance and a point geometry.
Feature emptyFeature = Feature.newBuilder().dataType(MilitaryDataModel.getSymbolType()).build();
Point featureGeometry = GeometryFactory.createPoint(crs, 0, 27, 46);
Feature feature = symbol.copyToFeature(emptyFeature, featureGeometry);

// Declare the model metadata.
ModelMetadata modelMetadata = ModelMetadata.newBuilder().title("My Symbology Model").build();
FeatureModelMetadata featureModelMetadata = FeatureModelMetadata.newBuilder().dataModel(MilitaryDataModel.get()).reference(crs).build();
Bounds modelBounds = GeometryFactory.createBounds(crs, featureGeometry.getLocation(), 0, 0, 0);

// Build an IFeatureModel containing only the feature we just created.
IFeatureModel militarySymbologyModel = FeatureModelBuilder.newBuilder()
                                                          .modelMetadata(modelMetadata)
                                                          .featureModelMetadata(featureModelMetadata)
                                                          .bounds(modelBounds)
                                                          .features(Collections.singletonList(feature))
                                                          .build();

// Finally, put the model in a layer, and add it to the map.
// A default IFeaturePainter is automatically deduced from the model's data model.
FeatureLayer layer = FeatureLayer.newBuilder().model(militarySymbologyModel).build();
map.getLayerList().add(layer);

See this article if you want to visualize custom features as military symbols.

Create a Military Symbology model