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The president has long had the authority to order port calls and dispatch senior officials, so both measures are somewhat symbolic but nonetheless irritate China, said Richard C. Bush, a former head of the American Institute in Taiwan, which handles the United States government’s contacts with the island.

When these were out of line, she knew her team had swerved, and she called out "Right!" or "Left!" to bring them back to the true course, just as a quartermaster would order "Port!" and "Starboard!" to his helmsman.

The boatswain blew his whistle which was followed with the Captain's order, "Port watch on deck; every other man to his post!"