I wasn't going to use vox-casters, but Gaunt's Ghosts mentions many times how well coordinated, trained and equipped the Blood Pact are. Even mentioning them looting imperial voxs. So the squad was finished off with a vox and an RPG.
Vox; talking on the horn.
RPG and loader.
Gave this guy a press-molded grotesk to make him fit in. Peer pressure and all.