It is Iran 's missile armaments that pose the greatest concern for American forces in the Gulf, especially for the US Navy.

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Iran",
        "Start": 6,
        "End": 10
    },
    {
        "TypeName": "LOC",
        "Text": "Gulf",
        "Start": 90,
        "End": 94
    },
    {
        "TypeName": "ORG",
        "Text": "US Navy",
        "Start": 115,
        "End": 122
    }
]