ATLANTIC OCEAN (Oct. 30, 2021) Lt. Phillip Ketsdever, right, explains how to properly fire a MK-38 25 mm machine gun system to Capt. Robert Aguilar, the commanding officer of the aircraft carrier USS George H.W. Bush (CVN 77), left, during a training evolution on the ship. George H.W. Bush is operating in the Atlantic Ocean in support of naval operations to maintain maritime stability and security in order to ensure access, deter aggression and defend U.S., allied and partner interests. (U.S. Navy photo by Mass Communication Specialist 2nd Class Steven Edgar)