Gland War Veteran
Gland War Veterans (Called Glandies or Gland Warriors for short by some in /tg/) were a specialized, genetically modified force of Imperial Guard Veteran designed to battle the Tyranids. They are considered by the Mechanicus as a far more successful and stable compared to the Afriel Strains.
After the Forge World of Dantris III became heavily infested and polluted by Tyranid forces, the Techpriests of the planet modified several companies of the Lostock 23rd to fight in the hellish conditions. Imagine Glandies as Space Marines without the power armor. They had many organs and drug-secreting glands implanted in their bodies so that they could survive unprotected such as an organ that would secrete stims, painkillers, and various medical drugs, more powerful natural air filters via a modified lung, enhanced bio-musculature structure for increased strength and etc. Their genetic tempering and augmentation has made them a distinct Abhuman, although whether they can breed and successfully pass on their genetic coding and new augmented organs is unknown. Their combat abilities and aggressiveness were also further increased in order to deal with the myriad of threats from the varied Tyranid forces.
Heck, the Gland War Veterans was so successful and super-anal retentive that even the Hive Mind thought was they were crazy and that; despite the heavy losses they took, was able to ensure the successful defence of Dantis III. Only three Gland Warriors are believed to have survived, which were taken by the Inquisition for study and "debriefing".
Gland War Veterans probably look almost indistinguishable from the average Human especially if he/she is in armor. Although they may be differentiated with increased muscle mass and veins popping up everywhere.
Due to their success, Gland War Veterans are getting increasing attention to the Imperial Guard and has been nagging the Mechanicum like a housewife to give them some of these augmented Abhumans. If you want to field them, use them as proxies and give them stats that make them really good at killing Tyranids and more importantly, acting as Space Marine-lite.