This is the story for call of duty 4 Modern Warfare's Islamic themed enemy.
The OpFor (short for Opposing Force) (Arabic: قوة معارضة) is a military-political force that seized power in an unnamed Middle Eastern country in 2011 following a violent coup d'état.
They serve as the main antagonists during the first chapter of Call of Duty 4: Modern Warfare during the USMC segment of the campaign
The OpFor, led by Khaled Al-Asad 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, American 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 OpFor detonated a large nuclear warhead, obliterating all American forces in the vicinity.
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.
Following Al-Asad's capture and execution by the SAS in Azerbaijan, it is likely that the OpFor either surrendered or were otherwise neutralized as a threat.
A faction called OpFor also appear in Call of Duty: Modern Warfare 2, based in Afghanistan in the missions Team Player and Endgame.
The nationality of the OpFor is never explicitly stated. The logo of OpFor is based on the Khanda emblem of Sihkism or the Emblem of Iran, with the military isignia and flags depicting 2 crossed swords, found in the Omani, Saudi Arabian, and 1996-2001 Taliban Era Afghanistan Coat of arms. Reference to the in-game maps does not provide a conclusion either, however, as different missions take place in different locations throughout the Middle East. Exposition given by Al-Asad in The Coup indicates that the nation was formerly a monarchy before President Al-Fulani was elected. While Charlie Don't Surf and The Bog take place within the coastal province of Jeddah in Saudi Arabia, subsequent missions War Pig and Shock and Awe take place in Riyadh, Saudi Arabia and the Basra Government, Iraq respectively. This evidence supports the idea that the OpFor nation is in fact fictional, and was created only for story and gameplay purposes. On a television in the mission Blackout, a news reporter describes it as a small but oil rich country, possibly inspired by Kuwait. It is possible they are from a non-existent country that Infinity Ward made up.
In some scrapped single player levels, such as Designated Training the unknown county is specifically called "Saudi Arabia".
This explains why most of the action in the Marine campaign is in Saudi Arabia and why OpFor troops use the G3, a weapon in use in Saudi Arabia.
Also, after Aftermath, the camera goes to a satellite image where part of the country is seen, and the coast looks similar to Saudi Arabia. The OpFor is referred by game code as "Arab". This also proves that OpFor is Arabic. http://callofduty.wikia.com/wiki/OpFor