AP Explains: What is Iran’s Revolutionary Guard?

FILE- In this Sunday, Sept. 24, 2017 file photo, a Ghadr-H missile, center, a solid-fuel surface-to-surface Sejjil missile and a portrait of the Supreme Leader Ayatollah Ali Khamenei are displayed at Baharestan Square in Tehran, Iran, for the annual Defense Week which marks the 37th anniversary of the 1980s Iran-Iraq war. Iran’s paramilitary Revolutionary Guard faces new sanctions from U.S. President Donald Trump as he has declined to re-certify the nuclear deal between Tehran and world powers. But what is this organization? (AP Photo/Vahid Salemi, File)