I was reading SW #56 for the first time and noticed that Simonson/Palmer had designed a new type of bomb squad stormtrooper (or “bombtrooper”), which according to Wookieepedia only appeared in this one issue (they didn’t do their job particularly well either I might add).

According to the article the design, especially the helmets, were based “unused concept sketches” for ESB. I googled it, but couldn’t find anything that resembled this design. Does anyone know which concept art these helmets are based on?

(The Wookieepedia picture didn’t show the whole design so I took a photo of my Norwegian edition of the issue.)