call of duty texturization process old gen

Good Companions, lately I have been in doubt about how the AAA companies texturized their models in the style of the old generation.

My doubt arises because it has always intrigued me the Call of duty company in its previous deliveries to the Call of Duty Black ops and as I am a fan of its zombie game delivery because I am very attracted to know the origin of that style of texturing

I have realized that its tetxurizacion seems real image projections worse someone in the forum has to know for sure its design process because I want to achieve that style of textures for my project. Thank you so much.