If there was ever an appropriate time to use the National Geographic meme of the guy with crazy hair saying "Aliens" it would be right here, right now.
That's right, aliens. They're coming to America and Rainbow operators Ash, Mira, and Thermite have created a new team called the "Rainbow Exogenous Analysis and Containment Team," or REACT for short, to eradicate them. These aliens are referred to as Archæans and as you and two other players, if you don't want to run solo, move through one of the 12 maps to get them out the challenges will only get harder.
According to Ubisoft, all 12 maps are divided into four different regions of the United States in this PvE style game and as you progress further into each region the aliens and infestations get tougher; but the rewards become better as well. After completing one part of a sub-zone you, and your team - if you have one - can decide to venture further into the region and take on harder Archæans for better rewards, or you can...