Since she was the queen of Ra, Hathor might have used Horus Guards many thousands of years ago. She also used a mixture of Horus and Serpent Guards on the planet Eskal before her death. It is unknown what happened to these Jaffa. (SG1: "Out of Mind", "Into the Fire")
Teal'c has used Horus Guard armor on two occasions. The first was to trick Amaunet into believing Heru'ur had stolen the Harcesis child she had just given birth to and trick Heru'ur into thinking he was one of his guards. The second was to steal a Zero Point Module Ra had five thousand years in the past. (SG1: "Secrets", "Moebius, Part 1")
The Horus Guards used by Ra himself on Abydos, as well as their leader, Anubis, were not biological Jaffa but humans. (Stargate)
One of Heru'ur's Horus Guards firing his staff weapon.
Two of Ra's Horus guards on Abydos.
Amaunet's Horus Guard.
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