USNIによると、リベリア船籍の5万t級タンカーらしい。

https://news.usni.org/2017/08/20/uss-john-mccain-collides-merchant-ship-south-china-sea-search-rescue-operations-underway
＞The guided-missile destroyer USS John S. McCain (DDG 56) was involved in a collision with the merchant
＞vessel Alnic MC while underway east of the Straits of Malacca and Singapore on Aug. 21.

ALNIC MC
https://www.marinetraffic.com/en/ais/details/ships/636017930