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US Navy NS Boatswain's Mate Seaman Jake Cain throws mops off the stern of the Amphibious Dock Landing Ship USS Fort McHenry LSD . en ATLANTIC OCEAN Oct Boatswain's Mate Seaman Jake Cain throws mops off the stern of the Amphibious Dock Landing Ship USS Fort McHenry LSD Cleaning mops this way uses the highly aerated screw turbulence