The red cockpit lighting went away in the 1980's in US Army Chinooks, when they were modded for NVG compatibility - they switched to the blue/green type.
Rear cabin still had red/white interior lights (selectable by switch) at that time, don't know if they've changed them out since then - haven't set foot in one since 1989. And as SASless pointed out, it's a white position light in the rear.