Ive found these images of power armor from a Anime adaptation of Starship Troopers and since their really aren't that many images here of original novel armor on deviantART I thought that Id post these here for future reference.
Im also going to post other images (oddly all from japan) of other versions of the Marauder armor to compare but I personally thought these appeared most likely true to the original source material.
The above image is for a Mobile infantry Command armor suit it appears to be either carrying or riding a large weapon (I dont know exactly what it is). Its a command suit due to its higher level of communication and sensory gear seen attached to its back.
Please enjoy and comment.