end of days military book part one

Two companies Eagle and Wolf are dispatched to Salt Lake City Utah(Utah being me birth state) but a natural virus is turning humans and animals alike into flesh craving monsters.They thought building a wall around the city was the hard part since salt lake is the only in infected city by these.....zombies.But tensions rise as supplies(food water and medicine and ammo)run thin with 5 M1A2 Abrams main battle tank strictly not allowed for outside the wall use and 100 humvees the companies(100,000 men and women each more of a army I know shut up)dispatch 30 humvees and 50 men from both companies to try and find supplies