First of all, I created a new empty Maya file and the export the files I need (e.g. Building, NDC soldier, and FF soldier) as a reference file. Meaning, that the file is sourced from another file and can only be tweaked or edited from that source. The referenced file can only be animated and any other option that has nothing to do with the list before.
The animation started with NDC soldier seen sniping from the building’s window. This part going to be slow as it is still the beginning of the animation.
Simple rendered animation.