Photo gallery: USS John S. McCain collision

Damage to the portside is visible as the Guided-missile destroyer USS John S. McCain (DDG 56) steers towards Changi naval base in Singapore following a collision with the merchant vessel Alnic MC Monday, Aug. 21, 2017.

The Guided-missile destroyer USS John S. McCain (DDG 56) is moored pier side at Changi naval base in Singapore following a collision with the merchant vessel Alnic MC Monday, Aug. 21, 2017.

The guided-missile destroyer USS John S. McCain, with a hole on its portside after a collision with an oil tanker, is escorted by Singapore Navy RSS Intrepid to Changi naval base in Singapore on August 21, 2017.

This handout from the US Navy taken and released on August 21, 2017 shows tugboats from Singapore assisting the guided-missile destroyer USS John S. McCain as it steers towards Changi Naval Base in Singapore, after following a collision with a tanker.

An American flag is flown off the stern of The USS John S. McCain docked at Changi naval base after its accident Monday, Aug. 21, 2017 in Singapore.

The Guided-missile destroyer USS John S. McCain (DDG 56) is moored pier side at Changi naval base in Singapore following a collision with the merchant vessel Alnic MC Monday, Aug. 21, 2017.

The USS John S. McCain conducts a patrol in the South China Sea while supporting security efforts in the region on Jan. 22, 2017. The guided-missile destroyer collided with a merchant ship on Aug. 21, 2017, in waters east of Singapore and the Straits of Malacca.

The USS John S. McCain joins a combined formation of Japanese and American ships on Dec. 10, 2010. On Aug. 21, 2017, the USS McCain collided with a merchant vessel near the Strait of Malacca in the waters east of Singapore.