ATLANTIC OCEAN (May 23, 2021) Standing NATO Maritime Group One (SNMG1) Flagship HMCS Halifax fires its 57 mm main gun off the coast of Portugal on May 23, 2021 during Exercise Steadfast Defender 21. HMCS Halifax is participating in the Combat Enhancement/Force Integration Training Phase of Steadfast Defender 21, a defensive exercise based on an Article 5 scenario which is designed to deter aggression and respond to crisis if necessary. The Maritime Live Exercise is taking place from 20-30 May, 2021 in the waters off Lisbon, Portugal. (NATO photo by Sailor 1st Class Bryan Underwood, Royal Canadian Navy).