FILE - In this Thursday, June 13, 2019 file photo, an oil tanker is on fire in the sea of Oman. For decades considered a U.S. national security priority, the Persian Gulf remains home to tens of thousands of American troops spread across sprawling bases protecting crucial routes for global energy supplies. But while U.S.-Iran tensions in the Gulf appeared close to sparking a global conflagration this summer, attention now rapidly has shifted to Syria. (AP Photo/ISNA, File)
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