ATLANTIC OCEAN (May 22, 2021) The Spanish navy frigate ESPS Mendez Nunez (F-104), left, flagship for Standing NATO Maritime Group 2, conducts a replenishment-at-sea with the Military Sealift Command fast combat support ship USNS Supply (T-AOE 6) off the coast of Portugal, May 22, 2021, during Exercise Steadfast Defender 21. Steadfast Defender is a defensive exercise based on an Article 5 scenario which is designed to deter aggression and respond to crisis if necessary. (Photo courtesy of the Spanish navy by Petty Officer Laura Pons Miles)