Unit for Special Operations (Serbian: Јединица за специјалне операције, romanized: Jedinica za specijalne operacije; abbr. ЈСО or JSO) or Special Operations Unit, also known as Red Berets (by berets; Serbian: Црвене беретке, romanized: Crvene beretke) or Frankies (by Franko Simatović; Serbian: Френкијевци, romanized: Frenkijevci), was an elite special forces police unit of the FR Yugoslav State Security Service (RDB).