It's 2 and 1/2 months since the heirarchy have landed on earth. And there is a lull in the war. The heirarchy have won the battle of baltimore and had D.C. surrounded. They decided to set up a researching base in the rockies, developing new weapons. One such weapon was a new superweapon being designed to fit onto Science walkers. This weapon may have crushed the humans before the novus arrived. Human scouting parties managed to slip through defenses to the rockies. They saw the heirarchy developing somthing. They sent word to D.C. The pentagon decided to send an airstrike to what the heirarchy presumed what was a "safe" base. First they had to make it through the base in between D.C. and the rockies.