Quick question. How is the issue of human waste processing done in large scale temporary human accommodations such as a military forward operations base or a la

Quick question. How is the issue of human waste processing done in large scale temporary human accommodations such as a military forward operations base or a large scale construction township? Would it have the necessary sewage handling/treatment facilities built first or are there temporary systems that can handle a sudden surge in the generation of human waste away from any pre-existing sewage treatment facilities?