USNS Patuxent takes fuel at Loch Striven in Scotland. American ships can now take on fuel from Royal Navy depots in Scotland, in a move designed to support U.S. Navy operations in the North Atlantic and Arctic. The Royal Navy say here that the two nations have signed a fuel storage agreement, giving the US Navy access to two key depots on the West Coast, this is outside of the NATO framework the access was previously under.

https://ukdefencejournal.org.uk/uk-and-us-sign-deal-to-use-naval-fuel-depots-in-scotland/