Frank E. Petersen Jr. Conducts Mark 38 Live-Fire Exercise
A Mark 38 25mm machine gun fires during a live-fire exercise aboard Arleigh Burke-class guided-missile destroyer USS Frank E. Petersen Jr. (DDG 121), Feb. 10, 2026. Frank E. Peterson Jr. is deployed to the U.S. 5th Fleet area of operations to support maritime security and stability throughout the Middle East. (U.S. Navy photo by Mass Communication Specialist 2nd Class Christian Kibler)