Some of the buildings in this game are real big and can take alot of time to move through them to really clear them out. I happen to not have a headlamp and night time can be real dark in buildings. And I keep coming across Monolith in little pockets of the base. Though eventually all will be cleared and it will say "auto capturing" meaning no more enemies near by to stop me from getting the base back under Military control.
Using the shotgun indoors seems pretty superior and those slugs can reach pretty far out, I found that out during this segment of the video while capturing the base.
