The Patrol Gone Missing secondary quest is available in The Witcher 3: Wild Hunt, found in the Nilfgaardian Camp in the far south east corner of the Velen (No Man’s Land) map. The quest is available on the Notice Board outside the Quartermaster’s tent, and you must ask the Quartermaster Tavar Eggebracht inside the tent about work. The Quartermaster informs Geralt that he sent some troops out to scout an area and they have not returned word and requests that Geralt find out what happened to them.