191204-N-DZ398-0135 ATLANTIC OCEAN (Dec. 4, 2019) Boatswain's Mate 3rd Class Charles Perdue opens a hatch to access a space with a simulated casualty during a general quarters drill aboard the Nimitz-class aircraft carrier USS Harry S. Truman (CVN 75) in the Atlantic Ocean, Dec. 4, 2019. The Harry S. Truman Carrier Strike Group (CSG) is conducting operations in U.S. 6th Fleet to support maritime security operations in international waters, alongside our allies and partners. The Harry S. Truman CSG last operated in the U.S. 6th Fleet area of operations in 2018, demonstrating its ability to operate from the High North to the east Mediterranean. (U.S. Navy photo by Mass Communication Specialist Seaman Donovan M. Jarrett/Released)