The Sevom Khordad or 3rd Khordad is an Iranian road-mobile medium range air defense missile system that was first unveiled on 11 May 2014. It is believed to be an upgraded version of the Ra'ad air defense system and somewhat superior to the other version of Ra'ad, Tabas (air defense system), although it is more similar to the Ra'ad then the Tabas is. Its operational capabilities were confirmed when it shot down an American Northrop Grumman RQ-4 Global Hawk near the Strait of Hormuz. It is named after the Liberation of Khorramshahr which occurred on 3rd Khordad on the Persian Calendar.