|The following is based on Fallout Tactics and some details might contradict canon.|
Kansas City is a location in Fallout Tactics, which can be reached from Bunker Gamma. It was a Gammorin's Army base upon the remains of Kansas City, Missouri/Kansas. It also composed of another ghoul town in its center, independent of the Gammorin's Army named Gravestone.
Before the Great War, Kansas City was a major nuclear launch site. Although the city was hit by the bombs, the silo staff survived, but were turned into ghouls and formed a town in the center of the ruined city called Gravestone.
Before 2197, the ghouls formed a peaceful community and a cult, worshiping the only nuclear bomb left intact in the silo, which they called Plutonius. T-Minus became the first leader and bishop of Gravestone, in charge of both religious and civil affairs. Around 2198, Gammorin's Army established a base in Kansas City, and tried to assault Gravestone in order to get the atomic bomb worshiped by the ghouls. The ghouls hide in their cathedral, where "Plutonius" was held. A few weeks later, Defcon the actual leader and bishop of Gravestone asked the Midwestern Brotherhood of Steel to protect them against Gammorin's Army.
The Midwestern Brotherhood eventually came to help, arming the ghouls and acolytes of the cathedral and killing most of the attacking mutants. This squad was commanded by the Warrior, who managed not only to protect the place, but also launch a retaliatory attack on the super mutant base in Kansas City, killing their three commanders (one being Juggoknot) in the process and securing the area. In exchange for their aid, the Midwestern Brotherhood of Steel demanded the ghouls give them Plutonius, which was later used to blast the vault door off Vault 0.
The mission in Kansas City involves defending a town of ghouls from an impending super mutant invasion while simultaneously finding and eliminating the super mutant commanders.
Kansas City appears only in Fallout Tactics.