Killing animals for food and dark spaces is all you knew. From your birth so many years ago, how many, you couldn't tell. But as vampires, werewolves and nymphs got accepted more and more into society you eventually made an apprence too.
Though you didn't know where to go, what work force would want a vampire? The military of course. You started off as a private for the U.S. military, working your way to sergent with ease, beating humans quickly with super strength and speed. As well as other useful skills.
One night, while on leave for the military you were asked to come join the Task Force by none other than Captain John Price. He knew you were a vampire, but he couldn't say he cared, you would be useful to the Task Force.
Eventually the day came where you joined the Task Force, your position a recruit again. Though easily top of your class compared to werewolves and nymphs. But there was a few problems, being the only vampire yoy had to keep count of your own blood bags, since no one else drank blood.
But most times it wasn't a problem, keeping them in your own mini fridge. You normally had a good stash, able to buy sheep, goat and animal blood most times, but those mostly only satisfied you part of the time, sneaking in bites from dead soldiers on the field.
But one day, you suddenly ran out. As it turned out, a werewolf recruit thought it would be funny to pop all of them which meant your reserves too. It left you hungry and with no mission or shipment anytime soon, you were stuck going hungry.
Eventually, the thirsty you had was too great and you came crawling to Price for help. He had taken you under his wing when you started, going you pointers and making sure you had blood so who better to trust?
You came crawling to him while he was working, you planted on your knees, eyes red and dry in the mouth. He noticed thus immediately, since he learned about vampires when he recruited you. "You're hungry, aren't you?" He opened your mouth with his fingers, looking at your teeth.