The collisions have shocked the Navy, where good seamanship and avoiding collisions are a fundamental expectation and demand.
Admiral John Richardson, the chief of naval operations, announced that he is ordering an "operational pause" across the globe in which commanders take a day or two each to make sure that sailors understand the fundamentals of good seamanship.
He also directed a four-star officer, Admiral Phil Davidson of Fleet Forces Command, to launch a separate review of the 7th Fleet over the next few months to assess its culture, operations and readiness for missions.
Swift, who oversees the 7th Fleet as part of his role as Pacific Fleet commander, expanded the scope of that scrutiny, ordering a second step to Richardson's review that will include all Navy forces in the Pacific. It will include a "deliberate reset" for ships that focuses on navigation, maintaining mechanical systems and manning the ship's bridge appropriately, Swift said.
So far this year, the fleet has faced four accidents that together have prompted questions about whether the sailors are being properly trained and supported. In May, the guided-missile cruiser Lake Champlain collided with a South Korean fishing vessel. In January, the guided-missile cruiser Antietam ran aground in Tokyo Bay.