HMS Dragon, seen here off Scotland's Outer Hebrides and Norway's Arctic coast. The three-week-long exercise, Formidable Shield 2021, tested missile systems, sensors, software - and the hundreds of men and women operating them as they demonstrate their ability to deal with the latest aerial threats. It saw live missile launches as the NATO allies demonstrate their individual and collective ability to track, identify and ultimately destroy incoming threats in the skies, including testing ballistic missile defence. HMS Dragon along with other warships participating in Exercise Formidable Shield took on fuel from the US Navy oiler USNS William McLean in the Atlantic Ocean with the Scottish Hebrides.