U.S.Navy Engineman 3rd Class Scotty Engelhard, from Lake St. Louis, Mo., works on a lube oil purifier in the main machinery room aboard the amphibious transport dock USS Green Bay (LPD 20), March 27, 2017.
Green Bay, part of the Bonhomme Richard Expeditionary Strike Group, with embarked 31st Marine Expeditionary Unit, is on a routine patrol, operating in the Indo-Asia-Pacific region to enhance warfighting readiness and posture forward as a ready-response force for any type of contingency. (U.S. Navy photo by Mass Communication Specialist Seaman Sarah Myers/Released). Original public domain image from Flickr