Code Name: Hemo-Viper
File Name: Various
Subjects are members of Cobra elite forces selected for a biological "enhancement" treatment using vampiric blood. The process enhances their speed, strength, healing, and durability as well as night vision capabilities at the cost of efficiency in the daylight. Subjects require consistent treatment with the serum or run the risk of turning feral - this effect can be alleviated by the drinking of human blood or human blood substitutes, which can be a cost-saving measure, but lowers the long-term efficacy of the serum as the vampiric biology takes over. Highly useful for covert operations and high risk missions.
"Remember when Mindbender and his crew circled the globe looking for the raw materials they needed to make Serpentor? Yeah, that lunatic didn't just find what he needed, and he kept notes on everything, including a 'biological weapon' found in catacombs in Transylvania. That man has never found a bad idea he didn't want to test out. Anyway, now some of our old war buddies crave the warmth of human blood, their eyes reflect like cats in the dark, they sleep in long, sealed boxes, and they look at you just a little too long when they get hungry. They've stopped assigning them to mixed units after the, ah, 'I got thirsty' incident last month..."