On November 4, 2016, three U.S. Army Special Forces operators were shot dead as they were re-entering the King Faisal Air Base, Jordan. Their killer, Jordanian Air Force Sergeant Ma’arik al-Tawayha, was stopped by another Green Beret before he could kill more Americans.

He was arrested, and after a controversial trial, was sentenced to life in prison, which often translates to 20 years behind bars in the Jordanian legal system.

The three Green Berets killed on that day — Sergeant First Class Matthew Lewellen, Staff Sergeant Kevin McEnroe, and Staff Sergeant James F. Moriarty — were assigned to the 5th Special Forces Group.

Now their families have sent a letter to Congress in an attempt to have the Jordanian airman extradited in the U.S. to face justice.