Do you have to go with the military dead rising 2

There are multiple different scenarios in which you can end up going with the military, or getting out alive.
For instance, you could get "Ending S", which to achieve that, you must do the following:

• Give all required Zombrex to Katey
• Complete all cases
• Give Zombrex to TK
• Finish Overtime mode

You could also get "Ending S", which can be achieved by doing the following:

• Give all required Zombrex to Katey
• Complete all cases
• Do not give Zombrex to TK

You may not get a happy ending, but those are the endings in which you do not go with the military!