crunch_helm01.dae use vertex colors, to display the colors on the model properly (at least the way i did it), add a color attribute node, add a mix color node, change the blend mode from mix to multiply, change the factor to 1.0, connect the base color node to a, connect the color attribute node to b, and connect the result to the principled bsdf base color.
the materials that use vertex colors are helmet_tube1, helmet_pipe1, and helmet_base1