925 sterling silver De Oppresso Liber Ring. United States Army Special Forces distinctive unit insignia; the World War II V-42 stiletto fighting knife in the middle of the unit insignia and two crossed arrows is facing point upwards. Lieutenant Colonel Robert Tryon Frederick Ring A correct translation of the Latin phrase de oppresso liber would be "from (being) an oppressed man, (to being) a free one". In millimeters, this ring measures approximately 25mm tall by 17mm wide. In inches, this ring measures approximately 7/8 inches tall by 5/8 inches wide.