The commander of U.S. Navy destroyer USS John McCain has been relieved of his duties months after the service branch faced ridicule on social media for posting a photo of him firing a rifle with its scope mounted backward. Cmdr. Cameron Yaste was recently let go from his position "due to a loss of confidence in his ability to command the guided-missile destroyer," the Navy announced in a statement, without elaborating. In April, the Navy posted an image of Yaste aiming the rifle with a backwards scope on its Instagram account with the caption, "From engaging in practice gun shoots,...