1987 October rouge trade/ warhammer 40k 1st edition
1979 Alien film
1986 July Aliens Film

Imagine that Rouge trader comes out 1 year after aliens. Wonder if Aliens didn't come out would 40k be the same.

H.R Geiger 1975 is where the alien concept art is originated.

I just want to point out I mean Star Ship Troopers from the book which have Space Marine Power Armour. Not the Star Ship Trooper from the movie in the 1980s which came out after all the other stuff and pretty much had cadians in it.