The NCR probably has brodie-like helmets since they operate in the mojave, heat stroke and all

and since the NCR produces their own armour/uniforms they might not have the most advanced smithery's

Is that a NZ lemon squeezer hat?

I never understood why NCR had the brodie-like helmets and not the 1940's or 1950's like helmets. Hell in Fallout 4 they added a more accurate helmet item. Also I love that that one ranger kicks dirt on one of the captured guys, and his friend tries to kick his ass but is held back.

where did you get the combat armor models from?