The Navy knew about problems related to the state of its ships and crews years before those problems might have contributed to two collisions over the summer that killed 17 sailors, Sen. John McCain, R-Ariz., charged Tuesday.

Reviews in 2010 and 2015 pointed to limited training and growing maintenance backlogs that were degrading ships stationed overseas and potentially raising risk for sailors, McCain said during a Senate Armed Services Committee hearing on the incidents to hear testimony from the service’s top two leaders.