Psychic hood

By Syralus, in Deathwatch

Where is this found, if anywhere, in the Deathwatch books? In the errata it's mentioned as added for the Epistolary starting gear, but I don't see it mentioned anywhere else. I often miss things that are right in front of me, as I may very well be doing here.

Any help would be appreciated.

Thanks

Core Rulebook p. 171 (Armory/Wargear)