The rear red reflectors on the M923A1 are plain white textures rather than the proper red reflector texture. In older versions of the game this wasn't an issue. I've attached screenshots from v0.9.7.102 and current v1.7.0.54 for comparison. The textures are missing for all variants except the repair truck* (missing on covered and uncovered transport, engineering, arsenal, ammo, and fuel variants)

Also, on the Mobile Command Unit variant of the truck, the rear reflectors (rear- and side-facing end-outline markers) are amber instead of red, as they should.

* The repair truck is the only variant to have correctly displayed red rear reflectors and amber reflectors everywhere else.