I don't know, maybe I'm overanalyzing, but the weaponry and vehicles used by the UNSC didn't seem that futuristic. At best they seemed futuristic as measured by decades as opposed to centuries. I know they had to make a distinction between human and covenenant weapons but they could have just used things like railguns, coilguns and lasers which would make it futuristic yet still very recognizeable.
Most Helpful Girl
Eh maybe. But I still love Halo lol. :)1