US President Donald Trump named Iran's elite Revolutionary Guard Corps (IRGC) as an agency of international terrorists. The US has classified the military of another country as a terrorist group for the first time. The Islamic Revolutionary Guard Corps is a branch of the Iranian Armed Forces, founded by order of Ayatollah Ruhollah Khomeini following the Iranian Revolution of 22 April 1979. While the Iranian Army defends Iranian borders and maintains internal order, the Revolutionary Guard is intended to protect the Islamic republican political system in the country, according to the Iranian constitution.