The tundra is a unforgiving place, which is why it constructs a bunch of defense towers to keep the area under control. Without constant support from Sol-Tek, much of the place is abandoned, either succumbing to the environment or taken by the Raiders
landscape
The military of Sol-Tek lingers even after the destruction of Sol-Tek, leading them to fend for themselves without any backline support. This caused many military vehicles to be abondoned
Researchers were hard at work developing further advances in biology and technology. After a lack of funding due to the destruction, it has been abandoned, leaving it in disarray and a spawnpoint for the horde.
Not all of Sol-Tek is dedicated in mass destruction and profits, they also build cultural and commemorate statues for major figures within the organization and throughout the world.