Sentinel Nine is a handgun designed for the dedicated usage of the Division of Security Operations as a high-performance handgun. It is based on the SIG Sauer P226 E2, used by the Navy SEALs, which allows it to be fired accurately in extreme temperatures.
Sentinel Nine's origins lie with the Federal Bioterrorism Commission, who was behind the "Sentinel Project". Though handgun models such as the Samurai Edge showed some promise against bio-weapons, the FBC, with the budget of a small country, invested considerably in a dedicated anti-bioterrorism weapon. When the FBC shut down in 2005, the Sentinel was still in a prototype phase, and the project was left dormant until the founding of the DSO in 2011. At this point US agent Leon S. Kennedy took over as supervisor to the project, and made sure it fulfilled three criteria.
Versatility: The handgun had to be able to fire 9mm Parabellum rounds. This ammunition is commonplace, and can be easily obtained at a gunshop and, as 9mm handguns are common for self-defence, can be taken from the bodies of victims.
Stability: The handgun had to be resistant to rusting; weather damage; flooding and be hard to break. It also had to be resistant to acid which may be sprayed by a B.O.W.
Certainty: The handgun had to be accurate and fast on close targets without significant effects from recoil.