Having just watched 28 weeks later on DVD, I would just like to say that the US army got some things right and some things horribly wrong. They had prior knowledge of the existance and infection methods of the zombie plague.
The good
Their method was to contain, kill infected, kill everything if things go from bad to worse.
When things go FUBAR they firebomb and nerve gas the place. It is probably the best way to deal with that kind of situation.
The bad
Horrific preparations.
They heard civilians into a parking garage
they do not compartmentalize the city.
The do not use armored infantry.
What they should have done?
Preparations
*Set up the second floor of every inhabited skyscraper as a military stockpile and palisade. *Build "air lock" style kill zones on the second floor in the stairwells. Only one of the 3 doors (from the first floor, to the 3rd and to the military section) can physically be opened at the same time.
*Fill the streets with Bradley or Striker fighting vehicles. Zombies cant to jack against a few inches of steel plate.
Operations
At first alarm shut down the elevators. Evacuate civilians up, into the buildings above the air-lock kill-zones. Begin civilian evac by helicopter from the roofs. Mobilize the armored infantry to patrol the streets, killing all infected sighted. The exception to this is if the alarm can be identified to originate within your building. In that case evacuate the civilians down and into nearby buildings.
When the infected are sighted at an airlock shut down the door to the lower floor. If infected manage to get inside the airlock, gas em.
In a worst case scenario, you loose the civilian population of a single building. And that is only likely if the outbreak occurs within an inhabited building.
Where would I go? to the local wal-mart / generic superstore. They have food, guns, ammo, other supplies. I would gank the forklift and pile empty steel containers in front main doors and garden center. That should be enough to stop the initial wave of zombies.
Access to the interior of the building is handled from the rooftop by ladder and winch.
Use potting soil to create rooftop gardens.
In times of low zombie activity, use the forklift to arrange empty containers to block off larger parts of the parking lot. Use this space for additional gardening and the preparation of expeditions.
