Necropolis Guards were the Jaffa guards of the Goa'uld and former System Lord Sokar. Unlike the traditional silver-gray armor, the Necropolis guards wore red armor. Their helmets had horns, giving them a demonic appearance. (SG1: "Jolinar's Memories")
Apophis later absorbed all of these Jaffa into his army and outfitted them with serpent helmets, although they were allowed to keep their distinctive color scheme. (SG1: "Upgrades")
Apophis' Necropolis Guards firing staff weapons.