The airman was killed just east of the Five Ways roundabout on the A1101 at Barton Mills, Suffolk Police said
A 20-year-old United States Air Force serviceman has been killed following a collision with a car near his base.
The crash happened at 13:30 BST on Friday at the Five Ways roundabout near Mildenhall in Suffolk.
Police said the airman was on a motorbike when he collided with a silver Skoda near the roundabout on the A1101 at Barton Mills.
The dead man was stationed at RAF Lakenheath with the 48th Equipment Maintenance Squadron (EMS).
The airman died on Friday night after being taken to Addenbrooke's Hospital, Cambridge.
Col Robert Novotny, commander with the 48th Fighter Wing, said: "It's a sad day for the Liberty Wing, especially for those who knew this airman, and for his brothers and sisters in the 48th EMS."
The USAF said his name would be released following notifications to family members.
Suffolk Police was appealing for witnesses.
