These pistol-wielding infantry units come from the destroyed remains of structures, such as command centers or captured tech structures:

They aren't exactly very good combat units, but its fun to send a lot of them to their inevitable doom. They also are very light, which is why some of them appear to be floating in the picture. In reality, they got shot into the air by those Tomahawk missiles:

They have the same voices as from RA2, which was the inspiration for this. The shirt changes color depending on what color you picked, it isn't red all of the time.
-Jordan