The U.S. Navy is concentrating many of its most powerful vessels in and around the Persian Gulf.

It seems something could be about to happen—it’s not totally clear what. But the timing, one month before a transition of power in Washington, D.C., is interesting.

The appearance of an Ohio-class cruise-missile submarine on the surface in the Strait of Hormuz on Monday was the clearest possible signal of the Navy’s intention at least to send a strong message to Iran’s leaders, if not launch actual strikes targeting, say, Iranian nuclear facilities.

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