Blood Hunt

It is the year 2111 and 1st Lieutenant Kele-De (Kai) McMahon of the FAC (Free America Civil Militia) is called in by the FAM (Free America Military) to help solve the mystery of why a high-security, top-secret, bunker has fallen silent.
Civilian hunters and the best recon Air Force Squadron can't get close without eerie noises causing them physical harm. Heeding the summons, Kai brings in a legendary FAC platoon known to relish a good fight.
Will a Millennium Blood Hunter, and her platoon, solve the mystery? Where did everyone go? Why is the bunker silent? And what is that painful wailing noise?