The AMS was an American government agency responsible for worldwide criminal investigations and intelligence collection. Since the 1998 Curien Mansion incident, it has handled numerous cases involving outbreaks of biologically-engineered creatures. In 2003, the agency disbanded in wake of several other incidents. All remaining AMS agents have continued to collaborate in order to protect mankind, with top-ranking agent Thomas Rogan leading a secret division of survivors to accomplish this.
While the AMS' true purpose is never stated, it appears to be outside of other US Government organizations and/or jurisdiction. For example, when G confronts Papa Caesar he specifically places Caesar under "AMS arrest", though it is left ambiguous whether G actually has this vested authority or if this is a simple threat.
The Zombie Revenge instruction manual claims that the AMS is an American agency, this was later verified in Overkill, revealing that it was active during the 1950s being involved in the secrecy of the experimental "Formula X" that was originally intended to be used in "OPERATION OVERKILL".
The House of the Dead canon
- Rogan Commandos (unknown number; specified as members of AMS in The House of the Dead III's official game guide). One of them is Yukio.
- Unnamed agents (were turned into creatures; appear as enemies in the fifth stage of The House of the Dead 4).
- Unnamed AMS Director
Zombie Revenge canon
- The House of the Dead's Sega Saturn manual mentions an AMS Director, who claims to have some experience on Dunwich and the Miskatonic delta.
- Overkill also mentioned an AMS Director as well, though it is unknown if they are the same individual.