You will see that on many museum artifacts, rarely if ever on active duty gear although I have seen a couple NG Humvees with such subdued markings. Geneva Convention states that stars (national ID) are suposed to be on the front plate, both sides of the turret, rear of the turret OR rear hull plate and turret top..upper point facing rear. Many display items will have stars on the track guards (fenders) just to have something there. Some curators are not willing to put unit markings on some artifacts so not to slight other local units that had the same gear. Modern warfare seems to have changed a lot and it rare to see a tank in the middle east with any markings other than tactical unit ID and some Arabic slogans.....sorta like WW II Russian tanks heading for Germany.

On that M-46, the star should be on the blower housing and unit markings normally on the fenders or on the bow below the headlamps, as with the M-26..