200224-N-ON977-1031 NORFOLK (Feb. 24, 2020) Air Force Gen. Terrence J. O’Shaughnessy, commander, U.S. Northern Command (USNORTHCOM), asks Cmdr. Corey Poorman, right, commanding officer of the Los Angeles-class fast-attack submarine USS Pasadena (SSN 752), about the dynamics of a Los Angeles-class fast-attack submarine during a tour of Pasadena at Naval Station Norfolk, Feb. 24, 2020. The visit to Pasadena was part of the USNORTHCOM Commanders Conference designed to show capabilities of subordinate commands to enhance homeland defense initiatives. Los Angeles-class submarines form the backbone of the Navy submarine force, the class contains more nuclear submarines than any other class in the world. (U.S. Navy photo by Mass Communication Specialist 2nd Class Alfred A. Coffield/Released)