I've always been a bit unhappy with how the GenSec units looked in this game. They lacked any personality that made them distinctly GenSec, almost as if they were changed last minute before release. This mod redesigns the basic GenSec responders in an attempt to give them a more corporate design that's distinct from their FBI counterparts. The units changed include:

The riflemen. They now wear blue jumpsuits that match those worn by Captain Winter's phalanx guards, and have bright red goggles with gray helmets. Their armor now has an urban camo pattern, being very subtle on the light units' weaker armor and extremely obvious on the heavies' armor. The heavy units have been given gas masks and a bright hexagonal pattern on their jumpsuits, and the submachine gunners have a lighter helmet setup. The light units have had their shoulder pads from before the Enemy Visual Update restored, which comes with the positive side effect of not having multiple rigging and weighting errors in the models from that update.  The shotgunners. They now wear dark red jumpsuits that make them very easy to distinguish in a crowd, along with night vision goggles with red lenses. The heavy shotgunner now has a shell rack on his shoulder pad and armor (not pictured) to further distinguish him. On top of that, the r870-wielding light unit who only spawns on Mayhem now uses the GenSec light shotgunner's appearance instead of the rifleman's, so you will still see this design in vanilla gameplay.  The GenSec shield unit now has his own riot shield, along with now sharing his appearance with the submachine gunner instead of the rifleman. 

(the new shield does not appear in the non-Beardlib version)

The Skulldozer has received a minor redesign. His armor and other details that lack the digital camo are now a blue similar to the jumpsuit of his regular counterparts, and the colors of his digital camo have been desaturated to make the armor pop more and to make it match the regular units better. He also received a bright red visor to match their goggles and lenses. Although not as major as the other redesigns, it still has a little extra spice compared to the original.  As a bonus, this mod also includes a redesign of the classic Minigun Dozer, who only appears on Death Wish. He has also received the new red visor. Alongside that, he now wears the old Zeal light mask when you break his visor, to indicate his increased body health. If you do not want this redesign, simply open the mod's folder, open Units, and delete the pd2_dlc_drm folder.  (the mask does not appear in the non-Beardlib version)

Special thanks to Jarey and Rino for allowing me to use their classic gas mask asset, along with the Restoration Mod team for giving me huge inspiration via their OMNIA faction. 

To install: Simply drop the "Prettier GenSec Units" folder in mod_overrides. Note that BeardLib is required for this mod to function. 

A BeardLib-less version is available, but it is not without its limitations. Specifically, things such as the GenSec riot shield design, proper helmet popping, and rifle/shotgun color variations are absent (all light units are blue and all heavy units are red).