From the introduction:
The Future can be a scary place. New technology, new weapons, and new enemies to watch out for. You never know if the next alley might contain an alien creature bent on destruction of the world, or two chem-heads looking for their next score.
Advanced Arms is a speculative look into the future of the world of Ops and Tactics, introducing new armors, weapons, and equipment, that can be used for futuristic campaigns.