|The following is based on Fallout Tactics and some details might contradict canon.|
With your initiation now over the Brotherhood now reveals to you their highest objective, fragments of data, left over from before the Great War show that the ancients spent many years constructing Vaults to house the survivors. Recently acquired data however points to the creation of an enormous super Vault; this nucleus of the vault network was built to protect the greatest minds of the time and would be the spearhead of post war civilization. If the Brotherhood could find this vault and activate its systems, they would have access to technology resources previously undreamed of. As well as access to the ancients themselves but the journey to the calculated location of Vault 0 would be perilous. A large army and a vast area of operations would be required for a mission of this magnitude.
They planned to follow the roaring river to the south, forging alliances, gaining fresh recruits and if necessary eliminating aggressors. Bunkers will be established in each new region, to firmly establish a secure area of operations. When the Brotherhood's rule in the region is undisputed and their ranks are brimming with new recruits the real campaign will begin, heading back towards the mountains.
The Brotherhood's ranks have grown, and with this swell of numbers they find themselves coming closer to the ultimate goal the time to expand is now. Leaving an outpost behind the warriors begin moving westward into a region known as the Belt. It is a scarred and desolate land, filled with death and relics of a time before. Those who dwell here have scraped together a bleak existence built on blood and grim determination; these isolated people are as hard as any in the wasteland. Pressuring these people to join the ranks of the Brotherhood will not be easy, many will not understand the Brotherhood's glorious vision to reunite the people, some resistance is expected.
While the inhabitants are dangerous, the land itself has the power to stir up fearful memories in some of the Generals and Elders. They tell of the ill fated flight across the mountains, and how their mighty airships were torn apart. Old law and surviving data suggests that at least one of the great Brotherhood zeppelins was lost in this very region; if it were located there is a chance that the equipment and supplies contained could be salvaged and returned to the noble purpose for which they were intended. There might even be survivors, but few hold any real hope of this, only time will tell.
The super mutants were a powerful adversary of great strength and courage. Without the leadership of Gammorin though, they will never pose the same threat to the Brotherhood. It was the corruption of Gammorin that provided the most sobering lesson; even the purest of hearts may falter. The Elders and Generals must push their sorrow aside however, for they have more pressing matters to attend to. The data recovered from the Gammorin's base, indicates the mutant force's route, intercepted with the calculated location of Vault 0. It is possible that the mutant horde discovered the location of Vault 0 during their exodus from the west. Is there a connection between the mutants discovering Vault 0 and the emergence of the mechanical menace? Only time will tell the future holds one thing for certain more encounters with the Robots are inevitable and the Brotherhood has a new and deadly enemy.
The Brotherhood's fears are confirmed, the robots now have multiple production factories around the wasteland. They are concentrated heavily around the great mountains, in a region known as Colorado Springs. This is the fabled location of Vault 0, which houses the mastermind behind the robot menace, the Calculator. Data from the Brotherhood research center dates the origin of the robots before the war, that decimated the land, their purpose to help humanity crawl back from the brink of self destruction but the robots now seem to destroy the very humans they were created to save. They boast great strength and power and one factor seems certain, all life forms have become their prey.
The Brotherhood has adapted to new enemies before however, and with the development of new weapons they will adapt again. Brotherhood tacticians and Generals will not be idle, for new enemies require new tactics, assault squads must be directed at the robot production and command centers that supply the Calculator's metallic ranks. The Brotherhood's predicted losses are staggering but what is life as a warrior without peril?
In the paranoid times leading up to the war, new Vaults were being constructed every day. The ancient's temples of war known as NORAD became the home for Vault 0, a storage place for the cryogenically frozen geniuses of the time. The Calculator was built to be a mixture of machine and man, a gestalt of mechanical switches and human brains linked through a cybernetic interface. Supposedly representing the idea society, these brains were to govern the higher functions of the Calculator, powering its neural network. The Calculator was designed to oversee the repopulation of the continent in the event of a war and educate the new humanity in the ways of the old world but first it was to sterilize the land making a fresh start for the soon to be emerging citizens of Neo-America.
For this task the Calculator had at its disposal an army of emergency pacification robots that were designed to survive the holocaust and surface from the ashes immediately after to begin their task but a mechanical malfunction left the Calculator damaged. During the years since the bombs dropped mankind had defined its own ways in the darkness of the Post Apocalypse, only now is the Calculator activating it's robots and embarking on its mission of mass genocide. Because of hardwired programming it is unable to adapt to the world that has arisen while it slumbered. The Calculator will not listen to pleas or threats, it cannot be bargained with it must be stopped.