You can leave the warzone and then perhaps avoid the desert (if that's where your theatre of operations was) for the rest of your time. If all your killing was

You can leave the warzone and then perhaps avoid the desert (if that's where your theatre of operations was) for the rest of your time. If all your killing was done from an air conditioned office sitting at a desk that's more difficult to avoid for the rest of your life. Even the town you live/work in could become part of the problem.