There's a typo in the rules describing a two-player game. The correct text is:

"PLAYERS (2)

Islamic State (I.S.) and Syrian Regime vs all others. Each player rolls for control of Iran each turn. The I.S./Regime player will control Hezbollah units, while the other player will control the Shi'a Militia and/or the Iranian air unit and its ground unit (the 81st Division) should it appear."