(This not canon, this alternate so all the things that happened in the movie or some are not included and some are.)

After the Skynet took over all of control of every Terminator, Electric Vehicles that are made by them except for the Presidential Nuclear Case.

You're a Soldier in the United Stated Army, the Terminators or Skynet captured and conquered 4 States including Tennesse, Colarado, Alabama, Mississipi you're being sent to defend either Washington D.C, Los Angeles or New york choose.