200529-N-MQ631-0153 ATLANTIC OCEAN (May 29, 2020) U.S. Air Force Gen. Terrence O’Shaughnessy, commander of North American Aerospace Defense Command and U.S. Northern Command, boards an EA-18G Growler assigned to the Rooks of Electronic Attack Squadron (VAQ) 137 on the flight deck of the Nimitz-class aircraft carrier USS Harry S. Truman (CVN 75) in the Atlantic Ocean, May 29, 2020. Gen. O’Shaughnessy, the operational commander, was aboard the carrier to observe the homeland defense operations. U.S. Northern Command's top priority is homeland defense, and leading complex multi-combatant command operations across multiple domains demonstrates USNORTHCOM’s readiness to defend the homeland regardless of COVID-19. The high-end homeland defense exercises are being executed by the USS Harry S. Truman carrier strike group. (U.S. Navy photo by Mass Communication Specialist 3rd Class Maxwell Higgins/Released)