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The OpFor (short for Opposing Force) (in Arabic: قوة معارضة) is the secondary antagonistic faction in the 2007 video game Call of Duty 4: Modern Warfare and a minor antagonistic faction in the 2009 sequel, Call of Duty: Modern Warfare 2. It is a military-political force led by the warlord Khaled Al-Asad that seized power in Saudi Arabia following a violent coup d'état.
In Call of Duty 4: Modern Warfare, the OpFor came to power during a violent military coup in the Capital City of an unnamed Arab country, securing its mineral wealth and cementing itself as a major power in the Middle East. Their coup culminated in the dramatic execution of former President Yasir Al-Fulani on international television.
Following their rise to power, U.S. Marines invaded the country in an attempt to remove the OpFor from power. Though the search for Al-Asad was unsuccessful, the Americans were able to score multiple victories during their brief campaign. In just a few days, the bulk of Al-Asad's forces had been pushed back to the Capital City where they were making their last stand. However, as US forces closed in on the last enemy stronghold, the Vladimir Makarov detonated a nuclear warhead that obliterated all American forces in the vicinity as well as OpFor soldiers.
It later became evident that the OpFor had been aided by the Ultranationalist rebels in order to draw attention away from the Russian civil war. The Ultranationalists had been supplying the OpFor with equipment, including weapons, vehicles, and, ultimately, nuclear ability. After the nuclear explosion, Al-Asad was tracked down by S.A.S. in Azebaijan, where Captain John Price executed him for his crimes after learning that he was in league with Ultranationalist leader Imran Zakhaev.
In Call of Duty: Modern Warfare 2, OpFor continued to wreak havoc across the Middle East despite Al-Asad's death. During the first two chapters of the game, General Shepherd leads the United States Marine Corps against OpFor militants in a winning battle. It is unknown what became of OpFor afterwards.