UK Armed Forces deployed Royal Marine Commandos and RAF personnel to the remote Arctic island of Jan Mayen alongside Norwegian and US allies for Operation Atlantic City, according to a Ministry of Defence press release published on 6 September 2026. The ministry said the exercise ran from 26 August to 4 September 2026 and formed part of Arctic Sentry, NATO's enhanced vigilance activity for the High North.

Personnel from LXX Squadron, RAF, deployed with detachments from UK Commando Force. The ministry said the trilateral force worked with the Royal Norwegian Navy, the Norwegian Home Guard and US Marine Corps units to integrate sensor and communications systems. Jan Mayen lies in the Norwegian Sea, roughly 620 miles from mainland Norway, north of the Greenland-Iceland-UK gap.

The ministry said the operation ran concurrently with naval manoeuvres during Operation Northern Viking 26 and built on similar Allied training around Jan Mayen the previous year. Defence Secretary Wes Streeting said the High North is vital to UK and NATO security and that the exercise demonstrated partnership with Norway and the United States.