Realizing that the United States' military capabilities are good enough, DARPA employees have turned their attention to replicating scenes from video game boss battles.
Considering the robots can use radar to see the bullet, calculate the reverse trajectory and have their own laser guided bullets heading towards you before it even hits... I imagine humans will only be fighting robots in person for a brief slice of history.
Initially you'll only be able to use them with a Zorg ZF-1 pod weapons system.