Halo: Assault on Squad 45 is hard to explain. On the one hand, it's corporate synergy, a joint promotional effort between 343 Industries and Mega Bloks, which makes a Halo Wars line. On the other hand, it's completely badass.
Halo Wars is a real-time action strategy game for the Xbox 360 that allows the player to control large armies and to shrewdly direct them in realistic warfare. Set early in the iconic war between the Covenant and UNSC - made famous by the Halo FPS games - Halo Wars provides a new angle on the war while bringing new heroes to the battle.