Which of the following is NOT a category of terrain?

In military doctrine, terrain is classified into several categories that help commanders assess how the landscape might affect their operations. The categories typically include unrestricted, restricted, and severely restricted terrain.

Unrestricted terrain allows for free movement and maneuvering, while restricted terrain presents challenges that can slow down movement and may require special tactics or equipment. Severely restricted terrain significantly impedes mobility and can limit operational effectiveness.

The option labeled as obstructed does not represent a recognized category of terrain within the standard military framework. Instead, it serves more as a descriptive term rather than an official category that influences tactical planning and operations. By identifying obstructed terrain, one may be acknowledging features that hinder movement, but it does not fit into the established classifications like unrestricted, restricted, or severely restricted. This is why the answer identifying obstructed as not being a recognized category of terrain is the appropriate choice.