English: Gas Turbine Systems Technician - Mechanical (GSM), Petty Officer Second Class Kristyann Azpiri inspects a sample of F-76 during an underway replenishment with NATO partner ship ESPS Patiño (A-14) of the Armada Española, while operating in the North Atlantic Ocean, May 19, 2023. USS Oscar Austin (DDG-79) is underway in support of NATO's Formidable Shield is a biennial integrated air and missile defense (IAMD) exercise involving a series of live-fire events against subsonic, supersonic, and ballistic targets, incorporating multiple Allied ships, aircraft, and ground forces working across battlespaces to deliver effects.