The movie took place at the time it was released (1996). But a lot of military tech the U.S. Army used were circa 1950s. Tim Burton has done this before. In Batman (1989) the mobsters use Tommy Guns but there's modern pop music (Prince). There are other examples I just can't remember them.
The Chitauri weren't too different from the Martians. Both used advanced tech but lacked any real tactics/military leadership. Loki and the Martian Leader were poor military commanders.
Originally posted by Impediment
Okay, let's not flame one another and turn hostile, please.The only reason the Avengers won is because of Iron Man flying the nuke into space and into the mother ship, thus causing all of the Chitauri to die all together. Major PIS, indeed.
I'm gonna have to lean towards the Martians due to their sheer numbers and tech.
Well, there's also the argument that we didn't have a chance to see, Thor and Hulk pushed their breaking points. I also argue that the, Martians only possessed a a fraction of the technological and spiritual awareness of the Chitauri and, Loki.