In the Star Wars VCR board game, which die face has the Stormtrooper symbol?
Based on evidence from a few photos online, it appears that the Stormtrooper symbol replaces the 1 on an standard die.

The Board Game Geek gallery for this game includes a few pictures of the die.

This image shows that the Stormtrooper does not replace the 3 or 5...



... and this image shows that it does not replace the 2.



Another image from VintageStarWars.net shows that it does not replace the 6.



I was unable to locate a picture with either the 1 or 4 showing, but since a standard 6-sided die is oriented such that opposing sides add to seven it seems reasonable to conclude that the Stormtrooper must replace the 1, since the 4 would be opposite the 3.  (It would also seem more logical to replace either the smallest or largest number, rather than one in the middle.)