A report of one side of the story is Fitzgerald 'suddenly' altered course and crossed the path of the ACX Crystal. It also goes on to say Fitzgerald did not respond to any warnings. Keep in mind thats only one side of the story.
The U.S. Navy is still investigating.
http://news.trust.org/item/20170626101937-6xsul
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Guardian of the honey and nuts
Let's assume I'm right, it'll save time.