The Immortal Guard of Imperial , also known as Imperial Guard , was both the personal guard force of Mohammad Reza Pahlavi, the last Shah of Iran, and an elite combat branch of the Imperial Persian Army. It was created in 1942 and disbanded in 1979 following the Iranian Revolution. It was named after the Immortals, an elite unit of 10,000 Persian soldiers in the army of the Achaemenid Empire.