ATLANTIC OCEAN (May 21, 2021) The Royal Canadian Navy frigate HMCS Halifax (FFH 330), right, flagship of Standing NATO Maritime Group 1, 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 Royal Canadian Navy by Sailor 1st Class Bryan Underwood)