Bahrain is the smallest country in the Gulf and hosts the most consequential piece of American military infrastructure in the Middle East. Naval Support Activity Bahrain, home to the US Fifth Fleet and Combined Maritime Forces, occupies ground in the island kingdom that no other location in the Gulf could replicate — deep-water access, proximity to the strait, political stability sufficient to sustain a permanent large-scale military presence, and a host government whose security dependence on the American relationship is clear-eyed and durable. The base is there because the geography and the politics aligned. Both continue to hold, under conditions that are more complicated than they appear.