230108-N-EI510-0042 PEARL HARBOR (January 8, 2023) -- Capt. Christropher Hedrick, deputy commander, Submarine Squadron 7, left, and Cmdr. Andrew J. Kopacz, commanding officer of the Los Angeles-class attack submarine USS Chicago (SSN 721), pose with the Battle Efficiency, or Battle "E", pennant January 8, 2023. The Battle “E” award recognizes crews with high levels of sustained proficiency and readiness to perform in an operational environment throughout a year-long evaluation.

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