34 years of war, billions of soldiers and civilians dead, all colonies on different planets under attack. And it is up to you to save them, as an commander of one of the Frigate Class ships named "Wings of a Angel" that came from an mission far in space to find new planets to life on, got the task to destroy the Covenant invasion of destroying humanity.
The Cougar is a lightweight, fast and highly versatile AFV constructed by the UNSC. It was designed for, but ultimately cut from Halo Wars. Although heavy anti-armor fire would blow the Cougar away quite easily, this vehicle was highly effective in holding off enemy armored vehicles until slower armored units could arrive at the battlefield. The Cougar had gained infamy in several urban tactical situations prior to the deployments in the war against the Covenant.