190713-N-RJ834-0160 ATLANTIC OCEAN (July 13, 2019) Ensign John Walter, left, and Damage Controlman 2nd Class Mikia Bollinger, right, check Ensign Allen Cook's firefighting mask for a proper seal during a general quarters drill aboard the Arleigh Burke-class guided-missile destroyer USS Lassen (DDG 82). Lassen is underway conducting a composite training unit exercise with the Harry S. Truman Carrier Strike Group. (U.S. Navy Photo by Mass Communication Specialist 2nd Class Tamara Vaughn/Released)