The first enemy I will describe is Guards.
The basic soldier of the Triad. This is the enemy we encounter most often. It takes little life, although if fired at close range, the effects can be disastrous. It's easy to kill, it's not very strong.
The Guards graphics are from the first Rise of the Triad prototype (September 1993).
In the description of the original RotT spec (https://legacy.3drealms.com/rott/originalspec.html) Guards is described as follows: "I think we've seen these. Now they have purple uniforms, if we have palette room."
However, I think the gray uniform will be best since it was used in the first prototype. Purple is for someone else ;)
credit: Apogee
FB Rise of the Triad: Wolfenstein 3D Part II - FB Site