@openstreetmap/id-tagging-schema/data/fields/military_service.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "military_service",
    "type": "combo",
    "label": "Military Service",
    "strings": {
        "options": {
            "air_force": "Air Force",
            "army": "Army",
            "coast_guard": "Coast Guard",
            "marines": "Marines",
            "navy": "Navy"
        }
    }
}