FragOps is a large mod for Unreal Tournament. The story line is as follows:
"The war against global terrorism has ended.
Late in 2005, NATO passed a resolution allowing military operations to take place in the private sector, due to a failing economy and severe lack of soldiers to secure the now-devastated eastern hemisphere. Hundreds of private Mercenary corporations immediately sprouted, offering to pay their employees steep sums to fulfill their contractors' needs. Tens of thousands of jobless fighters answered the call for work. And then it all went to hell.
The corporations became immensely powerful -- and rich, thus becoming more unscrupulous towards the contracts they accepted. The jobs often bordered on terrorism. NATO was powerless to stop them, with many major operatives now holding key positions in the council. In a last ditch effort, they called upon all 1st-world countries to train elite Special Ops units to help combat this powerful threat -- their leaders offering to pay the same price for men as the Mercenary corporations. The year is now 2006. The world is at war. There is no good, no evil -- nobody seems to be able to tell what either is anymore. The only thing that matters is the next paycheck... and where it comes from determines your alliance."