I'm investigating the possibility of constructing an Imperial Navy Trooper costume :) They appear in all three of the original movies serving in various guard roles. In the opening scene of Return of the Jedi, you can see them operating air traffic control for the Death Star. (Wonder which bands they use for such communication? :P) Later, some are surprised by Ewoks! They might not speak much, but they are dedicated, hard-working troopers.
This is my new fun project for the year :)