The extinguishers and valves covered by this specification are intended for use in military ground combat and tactical vehicles [such as the M992 Field Artillery Ammunition Support Vehicle (FAASV)]. Fire extinguishing protection will be afforded personnel areas, open areas and other compartments such as engine or ammunition storage spaces where there exists a potential danger of hydrocarbon fires. The dangers of detonation, deflagration and unobserved slow growth fires are due to the presence of highly combustible fuels, liquid hydrocarbons or flammable debris. The extinguisher will be operated manually or automatically in conjunction with an optimal or thermal fire sensing system. The extinguishers and valves are military unique because they have to operate in a temperature range between -51 to 71 °C (-60 to 160 °F).