I disagree with Aluthreney on a few things:
1) Vampirism is not being used so much these days. What we have is zombies, and zombie apocalypse only.
2) Certainly Twilight is not a good reference for Vampiric stories. If there are any games that are based on Twilight, they are not vampiric.
3) You brought something new to the Vampiric world of conflicts. In your story they are not fighting Lycans while trying to hide from humans. You talk about Ghouls, humans and Vampires in conflict. That is pretty cool!
There is only one thing so far that I didn't like much: Alucard is too soft at the beginning.
I never thought of seeing a Vampire Lord say, "Pleased to meet you Vayne, I’m Alucard.", for example.
I think a more harsh and authoritary figure would fit him better
Aside from that, the story is very good. And IMO it is awesome to have girls in the main plot of action, military stories.