With the review of the sequence of events and supplemental information complete, this post returns to James Reason’s accident causality model to “sort” the facts associated with the collision of the USS JOHN S MCCAIN (DDG 56) with Motor Vessel ALNIC MC on 21 August 2017 in the Straits of Singapore. The series is based on my perspective on HRO to illustrate key concepts that are hard to identify from the investigation reports.