LISBON, Portugal (May 20, 2021) A navigation officer stands watch aboard the Spanish navy frigate ESPS Mendez Nunez (F-104), flagship for Standing NATO Maritime Group 2, during the ship's departure from Lisbon, Portugal for 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)