Giving characters distinctive appearances without violating basic military realities presents a lot of challenges - particularly if the artist already has Only Six Faces tendencies.
Lunaram flings alternate space and warped realities about like heck in the latter part of the series, Lugeno is trapped in one, Finem does them, and they're treated like everyday appearances due to "god going berserk."
Roger is far from the sharpest knife in the drawer, but he is surrounded by a universe that seems to care more for appearances than realities, and is horrified by the very notion that a mop jockey can save their butts.