The 1941 invasion by the Allies of World War II resulted in a decisive loss for the Iranian forces, the deposition of Iran's Shah and five years of subsequent occupation,[3] while the 1980 Iraqi invasion began the Iran–Iraq War, which lasted almost eight years and ended in status quo ante bellum.

The army has also been actively engaged in quelling tribal and separatist rebellions beginning in the 1940s in order to protect Iran's territorial integrity.

[13][14] In 1993, the Iranian Army reestablished its professional peacekeeping units and declared that they are ready to be dispatched at the UN's directive.

[citation needed] The Iranian Army's maritime branch has launched several missions to fight piracy off the coast of Somalia,[16] securing the release of many other countries' sailors.

[17] The Iranian Army has deployed forces to help the Red Lion and Sun and Red Crescent societies in rescue and relief missions after domestic natural disasters, including clearing roads, reestablishing communications, supplying goods, airlifting equipment, transporting casualties and personnel and setting up field hospitals and post-hospital care centres.